[ame="http://www.amazon.com/Quantum-Thief-Hannu-Rajaniemi/dp/0765329492"]The Quantum Thief [/ame]by Hannu Rajaniemi.
I'm about halfway through and so far it's pretty amazing. It kinda reminds me of an updating of Varley's Eight Worlds stories, and I mean that as a high compliment, not as an indication the books' derivative.
The author has a remarkable knack for presenting a complicated far-future setting without resorting to infodumping, which at the same time is full of these wonderfully real, grounding details (some of which are still very imaginative, just non-science fictional) that the reader can immediately relate to.
In short, a wonderful book.