Both "The DaVinci Code" and "Angels and Demons" kept me up until the wee hours to finish reading them. I couldn't put them down; I thought both were interesting, fast-paced and based on very intriguing premises. I meant to watch the TV thing but forgot (was watching reality tV, haha). I agree with some previous poster that it somewhat felt like Brown was giving us the Cliff's Notes of some very interesting and complex theories (but on the other hand, more detail would have bogged down the plot).
Anyway, I loved them. I heard they're part of a series; he'll have similar ones set in London and other European capitols.