Apple today released a new build of its iOS 5 mobile operating system. If and when you plug your iPad or iPhone into your computer you'll be prompted to download iOS version 5.1.1 from iTunes. 

This update contains improvements and bug fixes, including: 

- Improves reliability of using HDR option for photos taken using the Lock Screen shortcut
- Addresses bugs that could prevent the new iPad from switching between 2G and 3G networks
- Fixes bugs that affected AirPlay video playback in some circumstances
- Improved reliability for syncing Safari bookmarks and Reading List
- Fixes an issue where 'Unable to purchase' alert could be displayed after successful purchase

For information on the security content of this update, please visit this website:

[Apple via MacRumors]