iOS 5.0.1 Aims to Address Battery Issues
01.01.70
Apple has released iOS 5.0.1 for all iOS 5-compatible devices, including both the iPad and iPad 2, the iPhone 3GS and later, and the 3rd and 4th generation iPod touch. It reportedly fixes bugs that reduced battery life, adds multitasking gestures to the original iPad, resolves bugs with Documents in the Cloud, and learns how to understand Australian accents better when taking dictation.
As usual, the iOS update is available via iTunes, where you’ll be getting the entire restore image (an 829.1 MB file for my iPhone 4), presumably to make restoring a wiped device easier. In a first, however, iOS 5.0.1 is also available via an over-the-air update. In that case, the iOS device downloads only a delta update, which is much smaller: only 39.2 MB for my iPad.
To perform an over-the-air update, open the Settings app, then tap General > Software Update > Download and Install. (Software Update is the second item under About; the General settings list is getting lengthy.) Despite the small size of the download, iOS requires some breathing room to install. As you can see in the screenshot, it’s telling me that I need at least 433 MB available.
Source: TidBITS