This is a Facebook chat plugin for Pidgin and libpurple messengers.
It connects to the new Facebook Chat IM service without the need for an API key.

Currently the plugin can:
Log into the Facebook servers.
Grab the buddy list.
Send/receive messages.
Add/remove friends.
Rreceive notifications.
Search for Facebook friends.
Set your Facebook status.

WWW: http://code.google.com/p/pidgin-facebookchat/