Yes, big fan! I think I've read everything by him now.
I found the Baroque Cycle just way too long and Quicksilver the best of the three. Cryptonomicon was better, but I was disappointed that Enoch Root was not more explained within the books as a whole. I've heard that he planned a book set in the future to feature Enoch Root, so maybe the explanation will come in that.
I like his use of large canvases and multipul characters, though sometimes it becomes difficult to follow them all.
Alcyon, I also loved Zodiac. From a realistic science point of view, it is probably the best enviromental disaster scenario I've read. (Though I like the idea of Kurt Vonnegut's 'Ice-9'.) Usually, you only get the kind of James Bond/Sahara/Doomwatch bad science.
The first of his books I read was Snow Crash, and I also preferred it to The Diamond Age. I've also read Interface.
I've already started threads for these books, so if you post in them maybe we can get a Stephenson forum here.