I'll take this opportunity to recommend that anyone who is in security should think about going to work at FireEye. Ridiculously cool technology, and they routinely lead Botnet takedowns to boot, e.g.

http://www.fireeye.com/news-events/press-releases/read/firee...

Email me at the email in my profile if you would like a warm intro.

Disclaimer: my brother is a long-time engineer.