>I was going to recommend the Laundry Files, damnit!

I'll third the Laundry Files. (Haven't read the most recent one yet, but I love the others to death.) Also really enjoyed Saturn's Children; I'm sure I'll pick up Neptune's Brood sooner or later.

The Merchant Princes novels are also well worth reading, although they're not the same sort of genre (being a mix of political intrigue and action/adventure involving parallel universes), if you like Stross' other output. Tonewise, they're in line with Saturn's Children rather than the more comedic tone of the Laundry Files.

Also, his novel Accelerando is available online for free, but it's not really anything to do at all with detective novels.

And, speaking of novels you can read for free online, John Scalzi's Agent to the Stars is likewise free in HTML format, and it's a lot of fun.

"Mathematics brought rigor to economics. Unfortunately, it also brought mortis."
- Kenneth Boulding