This discussion of Kurzweil and the postulated technological Singularity is worth reading even if, like me, you're a bit sceptical about the whole thing.
George Dvorsky makes the important point that the concept of the Singularity predates the relevant writings of Ray Kurzweil, should not be confused with Kurzweil's particular views, and does not stand or fall with them. Dvorsky provides an accessible summary of the other important thinkers who have contributed to the concept and its development over time.
Whether you're a sceptic or a true believer, and however you want to argue the toss when the subject of the Singularity arises in conversation - as it does, right? - you'll be much better informed on the subject if you read Dvorsky.