A while ago, Ira sent me a link to Go2Web20.net and I have been playing around with it a little at a time. The site is a directory of new, beta Web 2.0 sites. It's actually somewhat overwhelming to look through since there are so many sites it links to.
The site references everything from audio and video services to social networking to travel sites and beyond. Basically, it can refer you to a site that puts a Web 2.0 spin on many things that may interest you.
Caution: it's easy to spend way too much time on this site! Visit at your own risk.