For a long while now, Google has not released a new version of the GTalk client for Windows. This seems to be a well thought out strategy of moving everyone to their web based GTalk client - TalkGadget. All new features - invisibility, group chat, AIM interconnect have been introduced only in the web based client. Why is it so? I think this is because they are unable to monetize from the standalone client whereas they can show targeted ads in the web based gadget or through the client built in Gmail. Their plan eventually might be to migrate all users to the web based version. But the web based version is missing two critical features - Voice Chat and File transfer. Unless these two are ported I doubt the full scale migration will be complete
