Just finished Accelerando for my exams and really enjoyed it. The book gets better as it goes, and in accordance with Stross's singularitarian themes it's free on the Internet. What I think I like best about the novel is Stross's unflinching take on the "rapture of the nerds," which is reframed at one point in the book as "the Vinge catastrophe"; what the Singularity is for Stross is not so much the moment A.I. achieves sentience but the moment corporations do.