Apple just released iOS 5.0.1 build number 9A405, a minor update to its mobile operating system fixing (hopefully) the iPhone 4S battery woes. The software arrives just a day following the iOS 5.0.1 release to certain end-users for testing and a week following a developers-only version.
In addition to battery fixes, iOS 5.0.1 also enables multitasking gestures on the original iPad (go to Settings > General > Multitasking Gestures), fixes the Smart Cover security flaw, resolves bugs with Documents in the Cloud and improves voice recognition for Australian users using dictation.
You can update by connecting to iTunes and hitting the Check for Updates button in the Info pane or download an over-the-air update directly on the device (Settings > General > Software Update). Note that OTA update may not be available for everyone right away. If not, wait a little as these things take some time to propagate.
Full release notes and direct download links right below: