Ran across this today. Setting up a laptop, and one team we use Windows Live Messenger, the other Google Talk. I know there is Trillian, Digsby, etc, but I just wanted to use Windows Live Messenger, but still IM Google Talk contacts
BuddyFuse integrates Google Talk and Twitter into Windows Live Messenger
BuddyFuse to the rescue! Seems to be working well. Why just Windows Live Messenger? I like the presence it brings with Outlook 2010 and TFS, etc. More tightly coupled with the OS. Like using iChat on a Mac.