Someone here recommended Accelerando about a month ago - I’m sitting in an airport now reading it. It’s… deep. Probably one of the two deepest sci-fi novels I’ve ever read, beat only by Blindsight.
I’m not finished yet though, so that order could change :)
I read it after Prime Intellect during my AI binge. I think the initial feeling I got from it was the same as I did during first read of Snow Crash. Familiar world, and yet everything is very, very different so you feel more like an explorer than anything else.