Freaks and Geeks
The Simpsons
The Twilight Zone (original)
Seinfeld
MASH
Roseanne
Dallas (Thanks to my parents and then the 3 times a day reruns on TNN during college)
Six Feet Under
Sopranos
Seinfeld
Cheers
Leave it to Beaver
The Simpsons, and maybe The Critic.
Family Guy
(including “When You Wish Upon A Weinstein”… took me forever to find that one)
All of them.
oops… forgot to add:
Blackadder (which is how I got my handle 
)
**The Amazing Race 1,2,3 **
Freaks & Geeks
Will & Grace (I’m watching the first season now)
thirtysomething
Freaks & Geeks
The X-Files
The Sopranos
The Shield
BUFFY THE VAMPIRE SLAYER (bye, baby!)
My So-Called Life
Leaving aside short series like BlackAdder and Police Squad!, I’ve seen every episode of:
Star Trek (the original series)
Wiseguy (including the last two episodes that were only shown in syndication)
Monty Python’s Flying Circus (in fact, I went though the complete DVD set and watched them in order)
Survivor (series 2-6, didn’t see the first year)
And there are probably several other shows I’ve seen every episode of in their syndication runs; MASH, The Odd Couple, Mary Tyler Moore, Barney Miller, etc.
Every surviving William Hartnell/Patrick Troughton/Jon Pertwee era Doctor Who serials except two, all of Peter Davison’s stories except one, the first half of Colin Baker’s tenure, and all of Tom Baker’s except four.
Fawlty Towers
Kolchak: The Night Stalker
Monty Python’s Flying Circus
The Prisoner
Quatermass and the Pit
I did that. Almost non-stop over a period of two days.
Oh yes, and a couple others I forgot:
Blackadder (all four versions)
Inspector Gadget
and probably every episode of MASH* shown in syndication bar the final one.
Have seen all of:
Simpsons(I MAY have missed one or two this past year)
Sopranos
The Brak Show(again, one or two could have been missed)
SeaLab 2021(ditto)
Jackass:the TV Show
Dark Angel (because of my SO)
That 70s Show
Titus 
Undeclared
probably seen all of:
Get Smart
Cheers
3’s Company
MAS*H
The Kids in the Hall
The Critic
Undergrads
soon I will have seen all of:
Flying Circus
I’m embaressed to admit it but…
Smallville
24
Simpsons
King of the Hill
Friends
Newsradio
Scrubs
Gilmore Girls
Mad About You
Seinfeld
Sports Night
LA Doctors (only on for a season but I watched the all)
Ed
Saved by the Bell (the original)
Little House on the Prairie (thanks to TBS)
Boston Public
That 70’s Show
Everybody Loves Raymond
Every Trek series there has ever been.
All 3 Twilight Zones.
The Outer Limits (new, not the original).
Babylon 5.
Laverne and Shirley.
Happy Days.
Mork and Mindy.
Welcome Back, Kotter.
MAS*H.
Seinfeld.
Chicago Hope.
ER.
JAG.
Seinfeld.
Freaks and Geeks.
Malcolm in the middle.
Night Visions.
Hill Street Blues.
Miami Vice.
That’s all I can recall, but that’s plenty.
Oz
Simpsons
Cheers
MASH
Seinfeld
The Office (UK)
F Troop
St Elsewhere
Blackadder (UK)
Fawlty Towers (UK)
Monty Python (UK)
Beverely Hillbillies (I think)
Early Edition
My Favourite Martian(I think)
The Bob Newhart Show(Probably)
I Love Lucy (Maybe)
The Honeymooners (Maybe)
The Young Ones (UK)
Absolutely Fabulous (UK)
The Likely Lads (UK)
Banacek
Sledge Hammer
Quantum Leap (not sure - I thought I’d seen all but recently saw an episode I didn’t recognise)
It’s not that short. There were 24 to 26 episodes, depending on how you count.
Police Squad
Black Adder
Bottom
Fawlty Towers
I’ve probably seen every episode of Star Trek and a bunch of other series, but I’m not sure. I’m currently working on Xena and Twin Peaks.
Roseanne and Grace Under Fire are the only ones I’m sure of. Not that I particularly like them or anything, but they were in constant rerun rotation at 5am and I work nights. (It’s weird that Grace had 4 kids, but they were played by 7 different actors.)
I thought I’d seen all the SNLs, but every once in a while I see one late at night that I’d forgotten or was unaware of. When I was a nightclub comic in the late 80s/early 90s, I just wasn’t around a TV set much on Saturday nights. I still have yet to see the eps with Jodie Foster, Ray Sharkey and Blythe Danner, for example, and I don’t think I’ve seen the horrifying ep with Stephen Segall from start to finish.
Star Trek TOS, despite being in constant reruns somewhere at all times, still has a couple of eps I haven’t seen yet (like the Harry Mudd stories or the one where Spock gets it on with Mariette Hartley). It’s my own damn fault, I guess. Until a couple of years ago (I’m 42), I thought that Nurse Chapel and Yeoman Janice Rand were the same person. It’s also only recently that I saw “The Corbodite Maneuver” and “Return of the Galileo 7” (I’m sure I got both those titles wrong; obviously, it’s not a priority with me) which answered the question that always nagged me as a kid: “Why does Spock work for Kirk and not the other wqay around?”
None really. However, I tried to watch all the episodes of I’ll Fly Away.
Seinfeild
Chobits (Anime)
Intial D (Anime)
X 1999 (Anime)
Hellsing (Anime)
Invader Zim <-best show ever!
Trigun (Anime)
Does anime count? Or does it have to be on TV when you watch it? It’s not like I can watch it from some TV station, I don’t live in Japan.