Did my marathon viewing of season 1 over the weekend. Fantastic stuff. I think everyone was cast perfectly and like so many others think, thought the Imp stole the show.
There were a few parts that I don't recall from the book (like the Flower Knight giving Renly a BJ) but that's probably because the cast of characters is so large and there's so much going on.
Now I'm debating if I want to watch season 2 weekly or wait until the DVDs come out. Not because I'm not looking forward to season 2, but because the weekly wait is going to suck. I like being able to watch back to back episodes (or in some cases, back to back to back to back to back).