So I just watched the final episode of the first season of "A game of thrones" (the next season is being produced... Not like firefly). WATCH IT NAO.
Seriously, my absolute favorite book series ("A song of fire and ice") was made into TV series, and they did a remarkable job. Ok, yes, I enjoyed the books more, there was more content, among other things, but I don't want to downplay the show, it's amazing. It has too much nudity and 18+ material for my tastes (it's like they made sure everything in the books that was sex related made it on the show, and sacrificed better material on the stark younger children to compensate, tasteless shitty decision imo), but the majority of it is still great, and it's got pretty much all the important stuff of the books on screen.
If you like reading, you REALLY should read the series ("A game of thrones" is the title of the first book, like most epic series', expect it to improve with time...Though it doesn't take too long to get good), but if you don't read much and prefer TV, by all means, the show is excellent. I enjoyed both, and plan to do both again, and again. Do whichever you prefer first, but DO EEET.