My favourite Stross books are "Saturn's Children", "Singularity Sky" and "Iron Sunrise" in that order, to name some of his other books. "Neptune's Breed" is the sequel to "Saturn's Children". For "Singularity Sky" and "Iron Sunrise", I really enjoyed the concept of an AI that seeks to prevent the use of time travel to change history, by using secret agents that are distributed between multiple star systems.

I really loved the mechanism of time travel in singularity sky, namely that relativity doesn't suddenly cease being an intrinsic property of spacetime just because you have faster than light travel, and therefore traveling ftl will indeed take you back in time