Bold the ones you have seen more than half the episodes and * the ones you own.
1. Star Trek *(currently own just Season 1-4 of TNG. Hey, hellbob, TNG is better than TOS, because Picard is HOT!
2. The X-Files
3. Buffy the Vampire Slayer *(Own S1-5)
4. Farscape * (We only own S1&2 so far)
5. Monty Python's Flying Circus
6. The Simpsons * (own S1&2)
7. The Prisoner
8. The Twilight Zone (I must have seen over half because whenever it's on it's always one I've seen)
9. Xena: Warrior Princess (I was a total Xena addict when it was on)!
10. Pee-wee's Playhouse (I've never seen a single episode, or Pee-Wee's Big Adventure)
11. Mystery Science Theater 3000 (I've seen a lot of them, but I don't think half)
12. Family Guy *
13. Babylon 5 (I really do need to watch these)
14. Beauty and the Beast * (Loved this show! I've got a couple of the episodes on VHS, and I would totally buy the DVD's if such a thing existed.)
15. Quantum Leap
16. My So-called Life
17. The Avengers
18. Doctor Who (But I've mostly only seen the Tom Baker ones, and the doctor after him.)
19. Dark Shadows (Sort of... Watched the remake but never watched the original)
20. Twin Peaks *
21. Mary Hartman, Mary Hartman
22. H.R. Pufnstuf
23. Forever Knight
24. Absolutely Fabulous
25. Freaks and Geeks
Things I would add to the list:
Angel! and Firefly!