ShareThis is a free one-step sharing tool that allows publishers to virally spread their content and get free tracking. For the user, it's a way to share and show whatever you find interesting on the net. Use the ShareThis service to create a mashed up address book from your contacts on your favorite social networking sites and email for more accessible sending. Whether you go browser button or bookmarklet, or just clicking the ShareThis button on the publishers' blogs and sites, sharing has never been easier!
Don't have ShareThis? Check out http://sharethis.com/users