Friendz is an application for seeing what your Xbox Live friends are doing without having to turn on your Xbox360.

Current Features:

• See which friends you have online
• Icon badge to instantly see number of friends online
• Growl notifications for when you get new messages
• Growl notifications for when all/selected friends come online
• Icon bounce notification as an alternative to Growl
• The ability to send/reply to messages
• The ability to view and delete messages
• The ability to view Xbox Live GamerCards
• Send/Accept/Reject friend requests
• Delete friends
• Achievements

...and it's regularly being improved.