Submission + - The anonymous-HBGary story: How it happened (arstechnica.com)
Nate Anderson (the author) doesn't go into the technical details of how the servers for HBGary Federal were compromised, but he pieces together a nice chain of events and conversations between Gary and his programmer (who keeps saying Gary is being stupid), and the rest of the company from the emails and other stuff that anonymous posted on piratebay.
Thought it might interest the crowd here..