Early this morning, following the release of iTunes 8.0.2, Apple released iPhone Software 2.2 as a free download for iPhone and iPhone 3G users. Here is a partial list of new features contained in the update, according to Apple.
Fewer call connection failures and mid-call drops.
Improved Visual Voicemail sound quality.
Google Street View has been added to maps.
Public transit information and walking directions.
Dropped pins display addresses.
Current location can be shared via e-mail.
E-mail fetching problems have been resolved.
Wide HTML e-mail formatting has been improved.
Auto-correcting keyboard can be turned on or off.
Safari is more stable and performs better.
Podcasts can be downloaded from iTunes app, both on cellular (!) and Wi-Fi.
Pressing Home button from any Home screen returns you to the first Home screen.
Other features are included, as well. Version 2.2 is available by selecting your iPhone or iPhone 3G from the Devices list in iTunes version 8.0.2, and hitting the Check for Update/Update button.