via scobleizer: http://scobleizer.wordpress.com/2006/03/19/what-is-web-20-heres-a-list/
Sacred Cow Dung has a great list of *hundreds* of Web 2.0 services that are available now. He covers most of my favorites: flickr, del.icio.us and live but forgot to mention gmail.
The only obscure one I know that they’ve missed is jobster.