Hi Ike,
I've never heard about that simple.im . . .
maybe you could give me a link?
But, Facebook will support the Jabber Protocol.
http://www.insidefacebook.com/2008/05/13/f...pport-for-chat/
and, when it's supported, you could use Miranda Portable IM :)
http://portableapps.com/apps/internet/miranda_portable