Google Talk is the downloadable application (including to a mobile phone such as the new Droid) that connects with all features of
GMail/Chat from any device. Google Chat is the Secure Instant Messaging part of GMail. It is accessible from any computer at any time.
Google Talk Mobile allows you to control your "online availability" from your own mobile phone at any time...and your availability then
appears to others, whether they are at a PC, on the web or on their own mobile devices. You can easily set special notifications and
interact with all the text chat features. Scroll down this page to view details about download, install and setup