yoonoo * Manage all your Social Networks and IM in one place.

* Keep up to date with your friends update whilst on the Web.

* Unified Status Updates for Facebook, Twiiter and more.

To get this firefox plug-in – head off to http://api.yoono.com

This is a Firefox Plugin and adds a sidebar which to the left, you get pop ups on any status updates across all of your social networks, I have only just installed this so time will tell how useful it will be but it looks good to me so far.