http://www.babuki.com/mainpage/

Babuki – The Facebook Desktop IM (supports MSN AIM Y! Gtalk)

Chat to your Facebook, MSN, AIM, Yahoo and Gtalk friends from the web or the desktop.

Contacts all in one place

Now all your contacts are in one place wherever you are. There’s no need to create an account and you only have to add details for the other IM networks once.

Stay in control
Decide which of your Facebook friends can see you online with the stealth settings.