Today Apple released their latest iteration of their newly renamed OS, iOS 4. The devices compatible with this firmware release are: the 3G, 3GS, and the yet-unreleased iPhone 4. Owners of the latest generation iPod touches are also in luck.
To get this update, simply plug in your iPhone to your computer the way you always do. If iTunes does not prompt you to update your firmware, just click on “Check for updates”.