Subsume displays Growl notifications to let you know when your friends change their Facebook or MySpace status; and when computers connect/disconnect on your local network. Supports Address Book nicknames and photos. Can also update your chat status for specific activities.
Minimal CPU/memory use, just launch and leave running. This is just a very basic alpha implementation that'll flesh out into a more significant app with time-see the website.
What's new in Subsume
Version 0.8 alpha: Compatible with Leopard; fix for Facebook 'is is' status; adds IM status rules for Miro/Joost/DVD Player; icon changes and a notification is displayed when a new status/activity is started; version checking.