I believe in order to get both sides working is if you activate to try it out: Windows Live Messenger (formely known as MSN Messenger) or Yahoo! Messenger.
EDITED: I just tried this out and it was working pretty good - considering this being in beta stage.
I perfer the GAIM which takes in ALL of them... MSN/AIM/ICQ/Yahoo/Google chat and ichat.... these are compataible with ALL sites... heres the link that works with all this and even for mac users can use these! http://gaim.sf.net this helps me keep all my messages up to date and communicate with every ine in ONE IM with tabs inculded YAY for that... Screw the others blech!