Google has a section on server choice up in their Talk Q&A section. It talks about how IM and VoIP is not federated like email and the phone network. They make mention of their talks with Earthlink and Sipphone, but not a thing about the rest of the Jabber network. They do have an interesting quote, "We look forward to federating with any service provider who shares our belief in enabling user choice and open communications", and they provide a group on interoperability and an email if you want to join their federation.
I suggest we all send an email to the federation address saying something like, "Hi, I run a Jabber server and I would like to join the Google Talk federation. What do I need to do to join?" or something like that. Maybe they'll get the point after a few dozen emails that they need to do something.
