Google's Instant Messaging for Mobiles - Google Talk........

Google Talk is the latest feature on the new 3G iPhones, but will it live up to the hype the media built up anticipation for? What is this “Google Talk” business about, anyway? Traditionally, Google Talk refers to Google’s online chat system via Gmail. This new version of Google Talk lets the instant messaging program run via Apple Safari on the iPhone and the iTouch.

It’s “an iPhone-ized browser-formatted version of the Google’s text chat application,” the Washington Post clarifies. “This means you can’t talk over the Interwebs but you can tap out halting messages to your friends on the iPhone’s screen and, thanks to Safari’s tendency to clear pages randomly, you probably won’t enjoy a sustained conversation.”

Uhh… I think I’ll pass.
The reason that AT&T grumble about Google Talk, not to mention other IM clients for the iPhone like Meebo's Web-based IM app, is that it could reduce text messaging revenue. Under AT&T's current iPhone plans, text messaging isn't a major source of revenue. The phone company charges $20 per month for an unlimited data plan that includes 200 text messages.