I loved the sillyness of Douglas Adams, the even more old school sillyness of PG Wodehouse(wasn't geek but still pretty good).
I've searched and read some random sci-fi humour but wasn't blown away. Perhaps I was reading the wrong things. Do you guys have any suggestions?
http://www.lspace.org/books/reading-order-guides/the-discwor...
Specifically for geeks I would start, perhaps, with "Going Postal".