Google Talk uses the Jabber protocol, which is already built into a number of different IM clients. If you aren't running Windows, or if you want to run an all-in-one IM app, these instructions will help you get on the Google Talk network.

It is unclear if any of these clients will be compatible with the voice features of Google Talk. It seems unlikely. But they will support all IM functionality. The developer faq seems to suggest that voice interoperability will be available in the future.

How do I configure GAIM for Google Talk?
How do I configure iChat for Google Talk?
How do I configure Psi for Google Talk?
How do I configure Trillian Pro for Google Talk?
How do I configure Adium for Google Talk?
How do I configure Miranda for Google Talk?

• Jabber: Open Instant Messaging and a Whole Lot More
• Google Talk Developer FAQ