Accelerando is my all-time-favorite Sci Fi book. I read it twice now and will again in the near future. I'm 36 year old. I hope more people read this book.
It is really not my own favourite of the books I've written, though. (If you want to understand why, you might enjoy The Rapture of the Nerds -- my two-fer with Cory Doctorow, revisiting the same themes a decade later from a rather more tongue-in-cheek, not to say skeptical, direction.)