http://en.wikipedia.org/wiki/The_Green_Leopard_Plague
Umberto Eco's Prague Cemetery which expands greatly on a tiny section of Foucault's Pendulum. Eco's writing is extremely dense. Similar to Neal Stephenson, but with more of a literary flavor than a technogeek flavor. A nice way to balance out your reading if you find you are a bit too focused on modern technology.
I finally read Robert Anton Wilson's Illuminatus! trilogy. Early Internet and web culture was so deeply infused with RAW's ideas that the trilogy felt like one long déjà vu session. Lots of fun. RAW + Eco are a great antidote to taking conspiracy theories seriously, while having a ton of fun at the same time.
Gibson's Sprawl trilogy. Wow. Since the release of the Blue Ant books, I've been telling people that Blue Ant is the place to start, as it updates a lot of the underlying themes of Sprawl for this decade. But Sprawl is still very current and relevant. If you read Sprawl during or before the dot-com bubble like I did, you probably focused on the prophetic internet stuff. If you read it again, you will find out that there is plenty more interesting stuff to feed your brain in Gibson's early novels.