Apple has released an update to the 2.2 firmware which is available to download via iTunes. The main changes are performance improvements and lots of bugs are fixed. There are no new features in update though. There were rumours that new firmware will bring some new features but no significant change has seen as real thing is out now. Some people were also expecting Bluetooth file sharing feature in new version of firmware.

Here are links to download firmware direct to your PC. After downloading, connect your phone to iTunes and hit the update button while holding the shift key (in Windows) or option key (for MAC) and navigate to select firmware.
Download iPhone Firmware 2.2.1 (For 2G)
http://tinyurl.com/iphone2g-221-sizlopedia
Download iPhone Firmware 2.2.1 (For 3G)
http://tinyurl.com/iphone3g-221-sizlopedia
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