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 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.