I've decided to try to keep track of all the bands I've seen, which I know is probably impossible. I've been going to shows since high school, and I'm sure there are lots of bands I've seen that I've totally forgotten, especially if they were just opening, but here's my attempt anyway. Note that about the last year of shows I've been documenting in one journal or other, so I'll be spot on there! If you're not a music person, this will probably be pointless to you. Sorry. This is in vaugely chronological order. As I remember it. It could be very off.

* Current Band Count: 131 *

Trackstar
Sunny Day Real Estate (several times)
Mike Watt (eh)
[I recently found the whole line up from the mon September 6th, 1999 Lookout! Freakout! show I attended at Golden Tee Mini Golf Course, Castro Valley. The show was at 2 PM, we technically were too late to buy tickets and get in, but someone super cool working there got us in anyway since we were nice, and we pretty much all of the bands. Smugglers, Groovie Ghoulies, Pansy Division, and Mr. T Experience I all remember specifically. Others are rather vague in my head. Ironically, I now live just down the street from this very golf couse, and when I drove by it after moving here I got a freaked out nostalgia thing. After a few times going by it I was pretty sure it's where the Lookout! Freakout! was, and today the Internet has confirmed that. Cool.]
Mr. T Experience (at least three times, maybe four, once at the Lookout! Freakout!)
Phantom Surfers
The Groovie Ghoulies
The Smugglers
The Mopes
Pansy Division
The Hi-Fives
The Plus Ones
Towards An End
Pansy Division (one member in a dress, YES)

Videodrone (originally Cradle of Thorns)
Buck (crap)
Bracket (fun, but too many covers, though they did a rockin' 867-5309 and played a song with the entire band save drummer on their backs)
Add N to X (only band I've ever seen use a theremin live! Hardcore!)
Atari Teenage Riot (amazing stage presence, entire floor became a mosh pit)
Imperial Teen
Burning Airlines
Manic Notion (of course, since I was friends with them)
IBOPA (Indestructible Beast Of Palo Alto if you were wondering, numerous times)
Ten In The Swear Jar (one of many iterations of the IPOBA family)
Soul Kitchen (local Sunnyvale band)
Oranger (at least three times, possibly four)
Creeper Lagoon (so much better live than on their overproduced album, saw them twice, at least)
Crack (huge, energetic band)
Bright Eyes (when Bright Eyes was one insane guy yelling at an acoustic guitar "And to celebrate, I'll poiiiiissssoonnnnnn mysellllfffffff!")
Mates of State (kind of fun, kind of cheesy, but I appreciate the keyboards)
Murder City Devils (fucking incredible, saw them several times)
SOBUT (Japanese punk, Sons Of Bitches United and True)
Dead 'N Gone (drunk singer, looked like he was going to puke on us)
Boy Kicks Girl (one of many many many punk bands I've seen)
The Flaming Lips (twice, once during the Soft Bulletin tour, once during the Yoshimi tour)
Robyn Hitchcock (wow, he was fucking horrible live)
Sebadoh (they were not bad, though I kind of like the side project Folk Implosion more)
Aisler's Set (or however the fuck you write that... went to see them multiple times, but kept not getting into the show on account of not being 21; we listened to the shows standing as close to the doors as the bouncers would let us, I'm not sure we ever actually got IN to see them)
Machine Head (metal, whatever)
System of a Down (I liked them better when they were a wacky political metal band, what the fuck are they now?)
Primus (Primus sucks, yes, we know, and they were hardcore with Buckethead)
Slayer (RARRRRRRRR!!!!!!!!!!!)
Godsmack (fairly entertaining live, but kind of repetative and shitty anyway, yes, I understand that you like Alice in Chains)
Puya (metal + mariachi = shit)
Fear Factory (twice, awesome both times, one show it was the guitarist Dino's birthday so they hired him a stripped who stripped and then gave him a lapdance on stage during a song while the guitarist from I want to say Slayer filled in)
Static X (boy that guy's hair was tall)
Deftones (gee, I wish I was close enough to actually SEE the band, fuck you Shoreline)
Rob Zombie (not bad, but I wish it was a White Zombie show instead, though they DID play Thunder Kiss '65 and More Human Than Human, which won them lots of bonus points)
Black Sabbath (wow, they rock REALLY hard for old guys, Ozzy still has it, note for note perfect, better than the songs sounded on the albums they came from, this was '99)
Soulfly (eh)
Rammstein (wow were they bad live... just shitty German metal, you could only hear the synth on one song, pyrotechnics were sad, even the mosh pit was sad, and the fake ass raping of the keyboardist went comical when they couldn't get the fake penis to stop spraying water into the audience)
Jonathan Richman (you know, the guy wandering around playing music in There's Something About Mary... "Nineteen in Naples!")
U.S. Maple (completely horrible)
Pavement (pretty good, right before they broke up)
Mogwai (chill show, but really cool)
Tricky
ohGr (wow, that show was great, it was more rock than Skinny Puppy and Ogre is a great frontman)
Frank Black And The Catholics (frontman from the Pixies' solo project, super awesome, how come all you assholes who steal all the Pixies reunion tickets weren't there? Oh yeah, you're shithead poseurs)
Mindless Self Indulgence (several times, awesome every time, heart, "Turn on some lights! What, did you think this was a fucking goth show?!")
Deadsy (I like their music, but they all sat stock still on stage and well, just weren't very impressive as performers)
Tub Ring (SUPER AWESOME, and loved the frontman's musical theatre inspired dance moves and the keyboardist flying around, playing keys with his ass, face, whatever)
Uncle Fucker (okay, so speed metal + blue grass... why the fuck does this exist? sadly I knew many of the songs due to my dad being in bluegrass bands like Flat Broke throughout most of my childhood)
Nick Cave And The Bad Seeds (awesome, awesome, but what's with all the tranvestites in the audience?)
The Coral (these guys were fucking great, The Doors + a bit of reggae + pirate sea shanties = awesome)
Polysics (Japanese Devo-ish punk rock mixed with synth pop... ON SPEED? Awesome)
Deadutants (shrill gothy girl punk, bad)
The Odd Numbers (generic slightly surfy punk rock)
Kungfu Vampire (cool mix of hiphop, jazz, big band, punk, and other stuff)
Barr (gay hop, seriously)
This Song Is A Mess But So Am I (anguished synth pop with beats that reminded me of Aphex Twin and some noise/experimental stuff)
Babyland (seen them five or six times, awesome "electronic junk punk", sort of high spirited industrial, fun synth, drum kit made out of oil barrels and shit, plus they sometimes use road flares and shower the audience with sparks from a saw on a metal barrel, always awesome)
Midnight Laserbeam (seen a few times, kind of mellow industrial, I like it)
Clear Stridency (emo-ish metal, local, great drummer)
Words Like Shards (Santa Cruz metal, also great drummer)
Rezn (kind of melodic metal, local, good)
Apiary (raarrrrrrrr metal, really good stage presence, went to high school with one of the guitarists)
Falling To Pieces (cool local metal)
Ilvestgrol (Norwegian black metal from my former EA coworker Andrew)
A Plot To Blow Up The Eiffel Tower (generic indie rock, complete asshole frontman)
The Mass (super awesome metal, huge variety to their songs, the vocalist would stop sometimes to play saxophone and was actually GOOD at it!)
Carson Day (cool experimental electronic stuff, seen a few times)
Agents Del Futuro/Jesse (more cool experimental electronic with cool film components, seen a couple times)
Whiskey Dust (oh my god, hair metal!)
A Band Called Pain (really good metal, really unique vocals, funk bass)
Echo of Souls (pretty good metal, not very unique)
Only Human (Seattle metal, lots of heart)
Murder on the Dance Floor? (shitty awful metal/emo)
Terrorfakt (okay noise stuff, I wanted vocals)
E-Craft (awesome, fun, German hard EBM band, kind of silly, but enjoyable)
Mono No Aware (okay techno, just a guy twirling dials, so not that great stage presence)
8-Bit (goofy hiphop over NES synths, hot)
Sote (this dude from Iran who did a weird kind of ambient set, all while sitting in front of his laptop scowling)
Gray Area (sliding between punk rock and synth pop, REALLY COOL)
Front 242 (EBM, but somehow it got too dancey and cheesy techno-like, I was disappointed)
Styrofoam (sort of Elephant 6-ish pop with some synth stuff)
Dress Bessy (like The Apples In Stereo, only not as good)
Lovemakers (yay catchy retro new wave, but do you have to slavishly reproduce the 80's?)
She Wants Revenge (they're catchy and I like them, but they sound EXACTLY like Joy Division)
Cerberus (metal band from L.A., a lot like Pantera)
Life With Jonas (sort of punk/emo, did a The Cure cover)
Consectum (generic screamy EBM)
God Module (entertaining screamy EBM)
Swann Danger (EXCELLENT drummer, but were otherwise just okay)
Two Gallants (not bad, I cared more about their merch girl, though)
Jason Webley (insane guy with an accordion, fun and cool)
Tell River (folk band, sounded good for folk (which is of course not really to my taste), but also barely moved and seemed nervous)
Deathline International (okay industrial band)
Chemlab (FUCKING AMAZING, best show I've ever been to)
Jared Louche (Chemlab's frontman's solo show, part spoken word poetry, part story telling, part performing songs from his solo album Covergirl plus one H3llb3nt song, and no shit, one from Rocky Horror, God he rules)
White Rose Movement (pretty good neo-new wave, but same tendency towards slavishly reproducing the 80's and shallow love lyrics as others)
VTG (my friend Larry's industrial band is pretty impressive)
The Presets
Ladytron
TV on the Radio
Pets
Cancer Fad (screamy electronic mess)
The Fucking Ocean (cool indie rock band)
MOTOR (cool electronic band)
Nitzer Ebb (disappointing industrial band)
Front Line Assembly (pretty good industrial band)
Stormkern (cool mix of synth pop and industrial)
DJ Acucrack? (drum 'n bass + industrial)
The Ian Fays (adorable girl indie pop band)
TV on the Radio
Black Snake Moan (cool gothy metal)
Flatline Transmissions (another Joy Division wanna be band, a little more goth)
Protection
Claws
Land Shark
Hard Place
ADULT.
Bellmer Dolls
Aberdeen City
Electric Six
Bloodysnowman (cool electronic stuff)
Mochipet (cool electronic stuff)
Slave Unit (industrial-ish metal)
Stormdrain (industrial-ish rock)
Fawn (neo-new wave stuff, pretty good)
Ratatat
The Faint
Tinkture (cool girl punk rock)
Xiu Xiu
Bent
The Music Lovers
Jeremy Enigk
Scissors for Lefty
Shiny Toy Guns

I'm sure I've seen a lot more bands, but that's all I can remember now.