Loved Zodiac, Snow Crash, Diamond Age, Cryptonomicon (and his pseudonym books The Cobweb and Interface)
Could not, can not, get thru The Baroque Cycle...I just don't get it. I love his writing style, there are historical characters, Enoch Root from Cryptonomicon, etc... Just can't even get thru the first book.
I have Anathem, but haven't been motivated to get into it either.
And Snow Crash is more cyber than steam, but is still a great read if you liked Diamond Age.