Bob Hagen on botnet evolution

Bob Hagen has put up a post on the evolution of botnets at the Global Crossing blog.

(BTW, I'm hoping to have future opportunity to use titles like "Where the bots are", "The bots from Brazil", and "The bots of summer".)

UPDATE (August 27, 2009): I've replaced the above link with one to the Internet Archive, since the blog post is no longer present at its original location.