Nevermind answered my own question...google is a wonderful thing....
The firmware update contains minor bug fixes and improvements such as improved stability of Safari and a fix for an issue where some images saved from Mail do not display correctly in the Camera Roll.
The release notes lists minor bug fixes and improvements in iPhone firmware 2.2.1. They are mentioned below:
Improved general stability of Safari
Fixed issue where some images saved from Mail do not display correctly in the Camera Roll
-Thanks to Iphone Hacks