I really enjoyed Accelerando by Charles Stross. The book spans from present-day to post-singularity, and plays with the idea of what AI is along the singularity

I really enjoyed Accelerando by Charles Stross. The book spans from present-day to post-singularity, and plays with the idea of what AI is along the singularity curve. There's also the even-closer-future of REAMDE by Neal Stephenson.