Iron Sunrise

I was reading this at the same time as "A Thousand Sons" and had trouble deciding which to read at any given moment.
The plot follows the events after a massive act of genocide against a backwater planentary system, and the efforts to stop the "second strike" weapons from retaliating at likely aggressors.
It follows several characters from various interested factions, through various plots, counter-plots, espionage, politics, action and there's even some sci-fi thrown in for good measure.
I did really enjoy this book, but I've enjoyed all the half dozen Charles Stross books I've bought since reading "Halting State"(which I'll probably review at some point).  I find them very readable compared to some authors that can be very hit and miss.  
I think that Stross explains the ideas of his fictional universe well and gives some vivid descriptions.  I suppose you could argue that most technological ideas in sci-fi have probably been covered in some form or another but when it still feels fresh and interesting something's being done right.