Greg Baker blogged about it (and since it's a hot topic, it probably appeared in many other places) -- http://gregbaker.ca/blog/2010/08/07/p-n-np/

Also, from the blog post: "I see someone else has uploaded the paper. I should point out that in the email thread I got, Stephen Cook said “This appears to be a relatively serious claim to have solved P vs NP.". I would love to see that email thread.