Google Talk just announced joining the XMPP Federation (yay) with the stipulation that they require support for Dialback (http://www.ietf.org/rfc/rfc3920.txt). It seems to be working with the one contact I have tried so far.
Are there any issues that might come up? Is it just a fluke that I got one contact through? Is everyone else finding that we can or cannot talk to Google Talk users?