Apple today released a minor update for the iPhone and iPod touch. The update which weighs in around the upper 200MB mark depending on device seems to deliver just bug fixes according to the attached release notes.

iPhone OS 3.1.2 Software Update
This update for iPhone and iPod touch contains bug fixes and improvements, including the following:

• Improves accuracy of reported battery level on i
  Phone 3GS
• Resolves issue where third-party apps would not launch in some instances
• Fixes bug that may cause an app to crash when using the Japanese Kana keyboard

The update can be obtained using iTunes.