Google Talk has been made available as a web application for the iPhone, which sounds great if you want an instant messenger client, but in reality doesn't work particularly well because of the iPhone's current limitations. Because it runs in the Safari web browser rather than being a standalone application (they come next week), whenever the user switches to another application, such as Mail or Weather, Google Talk sets the user's status to "Unavailable" and the session is reset the next time it's accessed...