Just like the Movie list, this is directly taken from my constantly updated/modified list on Facebook.

10. Doctor Who
9. Firefly
8. IT Crowd
7. Usagi Drop
6. Cosmos - Neil DeGrasse Tyson's
5. Breaking Bad
4. Game of Thrones
[hider=3. Clannad + After Story]
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2. Extra Credits (Yes It's a webseries so some people may say this doesn't count. If so just move 3-10 up by one, and fit 'Spaced' in the now empty #10 slot).
1. Cosmos - Carl Sagan's