Sherlock (series 2)
Downton Abbey (series 1)
Fringe (season 4)
Avatar (all 3 seasons)
Game of Thrones (seasons 1 and 2)
The Fades (series 1)
Korra (book 1/half of season 1)
Whitechapel (series 1)
Bedlam (series 1)
Breaking Bad (seasons 1 - 4)
Eureka (season 5)
Luther (series 1 and 2)
Adventure Time (seasons 1 - 4)
The Hour (series 1)
Castle (seasons 1 + 2)
Still In Progress (for obvious reasons)
Fringe (season 5) - 3 more episodes to go ...
Revolution (season 1) - Decent, but I'm watching because of Abrams, Favreau, and Kripke.
The Walking Dead (season 3) - Getting better and better since season 3.
Warehouse 13 (season 4) - One of my weekly pleasures.
Doctor Who (series 7) - Despite the recent ups and downs, I'm still watching. Plus, Neil Cross has two episodes in the second half of the current series, along with Neil Gaiman.
Adventure Time (season 5) - Addictive and highly amusing.
The Hour (series 2) - One episode behind (it's on the DVR), but I'm really enjoying Whishaw, Capaldi, and West, as well as the police corruption arc of the current series.
Castle (season 3) - So much love for the show. Dunno why I didn't start watching earlier.