Great set of books. I got into these in high school but never watched the TV series until this past Christmas break and it's equally as well done. The series is well written, well produced, and has one of the best ensemble casts of current TV shows. I'm really impressed with Peter Dinklage as Tyrion, Aidan Gillen as Littlefinger and the actors that portray Ned Starks kids, particularly (Bran and Arya).
I'm curious what will happen if the TV series reaches the end of season 5 and there is no sixth book on the horizon. It's morbid to say, but George Martin is in his 60's and it's taken something like 5 or 6 years in between the last two books (and David Chase was supposed to be bad!), so if he--God forbid--passes away, I wonder if they'd cancel it. It's one of the more expensive shows on right now and will probably only get more expensive as the plot introduces even more visually complex settings, characters and storyline-payoffs. I think the Showrunners are superb, though, I believe they'd be able to make a compelling final two or three seasons out of the open storylines that the 5th book leaves open.