I've attended the annual Defcon Hacker conference every year since 1999 (Defcon 7) and every Hackers on Planet Earth conferences since 2000 (Hope 2000 a.k.a H2K). I've also started going to the annual Shmoocon conference since 2005. This area links to the photo galleries and sometimes notes for my own future referal because you know it's a good con when you don't remember much :)
Here are the pages related to my adventures at these great conferences and the talks I occasionally give at them
Defcon X, August 2nd to 4th, 2002
Defcon 11, August 1st to 3rd, 2003
The Fifth HOPE, July 9th to 11th, 2004
Defcon 12, July 3th to August 1st, 2004
Shmoocon 2005, February 4th to 6th, 2005