AirTalkr is a multi-protocol Instant Messenger that connects to MSN, Yahoo!, GTalk, AOL and ICQ. Not only that, it also has connects to to various Web 2.0 services like Flickr and YouTube. AirTalkr runs on Adobe AIR, so you will need the runtime to use it. As of now, AirTalkr can run on Windows and Mac. Also has Web version
LazySharer is a bookmarklet tool that helps you quickly share links with your friends on Twitter, Facebook and Delicious. The main focus is that you can share links quicker to the right services and it also suggests tags which you can use to later find your content or just to discover new connections.