ReadWriteWeb

ClikBall is a handsome looking new application built in part by Jesse Andrews, the man responsible for Greasemonkey script repository Userscripts.org. Described literally, ClikBall is a browser plug-in that allows you to share links and messages with friends, groups, privately, on Twitter and on FriendFeed. The service is in Private Beta, but Userscripts visitors were just welcomed in and the Andrews says ReadWriteWeb readers can join (and follow me) via this link.

That description above doesn't really do the service justice - it's the user experience that makes ClikBall stand out. There's something magical about the grace of the app, and there's clearly a premium put on sharing links that lots of other people will want to click on and share.