If you enjoyed "Snow Crash" and "Diamond Age", I'd recommend "Islands in the Net" (if you can get hold of a copy) and "Holy Fire" by Bruce Sterling. Or for something newer, "the Zenith Angle" by same. I've also enjoyed all of Willam Gibsons books, including the latest trilogy "Pattern Recognition", "Spook Country" and "Zero History". If you bothered to read through "Cryptonomicon" you'll either love "the Code Book" by Simon Singh more than I did, or hate it :-) Assuming you've picket through the classics shelf, you might have missed out on Samuel Delany - "The Einstein Intersection" might be a good one to try on for size -- although I actually found "Neveryóna" to be maybe his most interesting book (of the ones I've been able to get hold of) [edit: After "Dhalgren", that is. But I think "Dhalgren" is a bit like Joyce's "Ulysses" -- a classic I haven't gotten around to yet. I spent the better part of ten (10!) years reading through "Dhalgren", picking it up on odd holidays - never loosing touch with the intricate unreality within, readily satisfied after reading a few pages or a chapter -- like nibbling on a choice ham that didn't spoil. It's rather more complex than any of the…
Also recommended in this reply