Not sure if on Netflix but if you have not seen it (or them if I start rambling again)...
Curb Your Enthusiam (Larry David, co-creator of Seinfeld without the network muzzle... hilarious)
Veep (Julia Louis Dreyfuss, Elaine from Seinfeld, as the crusty Vice Pres of the US... also hilarious)
Arrested Development (of course and I know this is on Netflix because they brought the series back to life)
Game of Thrones is brilliant if they have it.
I will second the vote for Dexter if you haven't seen it yet, Breaking Bad is also great.
Weeds is pretty good but took me a while to get into (kind of like Breaking Bad but with pot and a little more comedic).
Extras (Ricky Jervais from the original UK version of The Office... way better than TO IMO)
If you are into Sci Fi see if they have Andromeda. Very underated show of that genre (again may take a bit to get into).
Speaking of Sci Fi... Red Dwarf is a pretty funny and classic poke at the genre.
I'll try to think of more.
Cheers.