I find Charlie Stross' book series "The Laundry Files" absolutely hilarious.

It's a wild and wicked mix of Lovecraft, a bit of computer science, general IT, Dilbert, the BOFH, Deighton - and maybe Aleister Crowley.

Highly recommended - if you're somebody who appreciates the BOFH stories, Acts of Gord or Dilbert.

(Btw, not recommended - at least not by me: Accelerando. I couldn't stand it.)