Smashing Magazine has put together a list of 20 plus icon sets that are not only eye candy, but they are also free. Some of the sets featured include: iPhoneSketch OpenPhone Pack Social Bookmark Iconset and Feedicons

I know there are still quite a few people who are looking for Web 2.0 based icons, especially those that were featured in this post Web 2.0 Icons but unfortunately, the link for those icons has been taken down. I have emailed who I believe are the creators of that specific icon set, but I have yet to receive a reply back. Some of the sets featured by Smashing Magazine do have Web 2.0 characteristics. Look at a few of those before you continue your search.