Game of Thrones is my favorite ongoing series. Ever since I started watching the first season, I've been obsessed with it. I've read all 5 books that have been published so far twice since the first season ended, and I've watched the first season twice as well. I can't wait for the DVD release of Season 2, and more importantly, the premiere of Season 3. March 31st can't come fast enough!
I also love Breaking Bad, Boardwalk Empire, Dexter and The Walking Dead.
But, my all time favorite show would have to be The Sopranos. Game of Thrones is the only show that could replace it.