writer of SciFi and other stuff
Singularity Sky ISBN:0441010725 - There are always people who think they're doing the right thing by inflicting misery on their enemies, kid. And you're perfectly right about brewing up biological weapons and spreading rumors. But... we can live with a low background rate of that sort of thing more easily than we can live with total surveillance and total Censorship of everyone, all the time.
Atrocity Archives ISBN:0441013651 kicking off the Laundry Files series: fun Magick. Interesting afterword on spy/horror niches and fit of Hacker in such environments. The Concrete Jungle piece published with it was also excellent: you won't look at a WebCam/CCTV the same way again...
Jan'2011 post laying out the order of various Laundry stories/books.
Jennifer Morgue follow-up also really good.
there's an RPG based on the series: