Minbif

You can now use the Facebook Chat from Minbif without any third-party plugin, and without all the bugs, since Facebook now provides XMPP access.

To set it up, it is very simple: get your username and password from here (click on "Pidgin"), and provide Minbif with:

/map add jabber USERNAME@chat.facebook.com PASSWORD &fb -!require_tls

The connection won't be encrypted, but if you use Facebook you already don't care much about privacy, don't you ? ;-)