Here's the list in countdown order!

50. Millenium
49. Deadwood
48. Simpsons
47. Family Guy
46. Burn Notice
45. 30 Rock
44. Danger Mouse
43. 'Allo 'Allo
42. Friends
41. American Dad
40. Extras
39. The Green Wing
38. Heroes
37. Band of Brothers
36. Battlestar Galactica (2003)
35. The Mighty Boosh
34. The League of Gentlemen
33. Nip/Tuck
32. My Name is Earl
31. Black Books
30. Studio 60 on the Sunset Strip
29. Friday Night Lights
28. Scrubs
27. Life
26. House M.D.
25. The Venture Bros
24. Dead Like Me
23. How I Met Your Mother
22. Harvey Birdman: Attorney at Law
21. The Colbert Report
20. Top Gear
19. Curb Your Enthusiasm
18. Frasier
17. Fawlty Towers
16. Black Adder
15. Boston Legal
14. Monty Python's Flying Circus
13. Father Ted
12. Six Feet Under
11. Red Dwarf
10. Homicide: Life on the Street
9. Spaced
8. Seinfeld
7. Firefly
6. The Office (USA)
5. Futurama
4. Arrested Development
3. Dexter
2. The Wire
1. The Shield

See below for breakdowns of the various shows!