Isn't it wonderful when you go to a conference you think you will know nothing about and it turns out you were doing some of it already! Makes you feel like you are on top of things!
What a great thing to discover! I am curious which Web 2.0 programs you are already using.
Wikis, YouTube, Facebook, Tagging, Podcasts, Blogs, Picasa come to mind. I bet most of the ASH community use these.