Another friend countered with another link, which points out a few errors in the article.
Charlie Stross is sceptical that it's coming within his lifetime.
Personally, I felt like 2067 was a reasonable date about 13 years ago. I've not seen any good reason to revise that since :-)
(I may or may not make it that far, depending on life-extension technology and the amazing advances in healthcare over the next few decades.)
Apparently the best book on the subject is Nick Bostrom's "Superintelligence", which I haven't read, but when my brain starts working again...
Original post on Dreamwidth - there are comments there.