Currently active series: Doctor Who, Sherlock, Game of Thrones, Castle, Scandal, 30 Rock, Modern Family, Elementary. I think that's it. (Edit: It wasn't. Once Upon a Time, Mad Men, Futurama, and Archer as well).
I'm also going through Fringe, Eureka and Farscape on Netflix and/or Amazon Prime, and also in the midst of a Better Off Ted re-watch. I also have plans to add The Wire to the list but first I need to figure out connecting HBO Go to my TV. I was also watching Torchwood: Miracle Day (I finished the first three seasons), but then they took it off Amazon Prime and you have to pay for it now
As with WesLY, if I listed all the shows I've watched in the past I'd probably never finish.