Previously I shared an alternative trick of getting Google Talk on iPhone and iPod Touch but perhaps that won't be needed anymore.
Google has officially released an iPhone compatible web app for Google Talk which lets you stay connected to your contacts on the go. The best thing is that it even works perfectly on the iPod Touch.
Just visit http://www.google.com/talk through Safari on your iPhone or iPod Touch to access Google Talk. This is a web app so you don't need to download or install anything.
The only difference between the iPhone and PC version of Google Talk is that whenever you switch away to another window or application in iPhone, your status will automatically be changed to "unavailable" and your session will be restarted once you return.
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