Grendel - YES, we can TOTALLY nerd out about Neal Stephenson!
I am convinced that he is... um... GOD. Surely no mere mortal can come up with the stories that he has.
I loved Cryptonomicon, too. You must read Snow Crash, if you haven't already. It is interesting and brilliant, and then you come to about page 200 and the full scale of the plot is revealed, including ancient Sumerian legends that were apparently talking about hacking the brain stem with select phrases
Awesomeness 
The Diamond Age is also outstanding. It took my breath away when I first read it. Everything it said was so insightful and pertinent - how to raise children, different societies, the future of tribes, computing, theater, etc. This reminds me that it's due a re-read.
Anathem was also amazing. And also incredibly brainhurty. If you loved Cryptonomicon, you must read Anathem, too.
On the other hand, I didn't get much farther than Quicksilver in the Baroque Cycle. It's been a long time since I've read it, but iirc it was all a bit of a joke - pirate, girl from a harem, etc. Maybe I should give it another go at some point.
Meanwhile, Seveneves is going very well 