I just got back from Las Vegas, NV where I attended Black Hat USA 2005. This IT security conference is incredible! All of the briefings are new material only, which give you a fresh perspective on security issues in the IT field. The presenters were people from The Schmoo Group, Dan Kaminsky, the Choicepoint CISO, and many others! I saw some excellent briefings and learned quite a bit. This conference is a "must attend" for any serious security professional.