Apple have released an update for iOS devices (iPhones, iPad's & iPod Touches). This new update, 5.1.1, is ready to be downloaded and installed right on the device by browsing to Settings > General > Software Update. The update fixes various bugs including an issue with warnings about successful purchases from the App Store, which actually succeeded once a suitable Wi-Fi network has been connected too.
The update is reasonably sized at just over 50MB and takes advantage of iOS 5's feature to update software in smaller packages downloaded directly to the device, negating the previous requirement to download over 700MB's to iTunes and then connect the iOS device to the computer to install the update.
Information from the Apple page:
