The free iPhone OS 3.1 Software Update includes some great new features, as well as all the features from previous updates. iPhone OS 3.1 gives you Genius recommendations for apps, lets you download ringtones wirelessly, offers a new way to organize apps on your iPhone, and more.Genius Recommendations for Apps - Get recommendations for apps you might like based on apps you’ve already downloaded.
Genius Mixes - Have iTunes create up to 12 playlists based on what’s already in your library. You don’t even have to choose a sample song.
Download Ringtones Wirelessly - Choose from thousands of iPhone ringtones on the iTunes Store and buy them with a tap.
Organize Apps in iTunes - Use iTunes on your computer to drag apps onto virtual Home screens, then sync them to your iPhone.
iPhone OS 3.1 also includes these features and updates:
* Improved syncing for music, movies, TV shows, podcasts, and photos
* iTunes U content organization
* Redeem iTunes Gift Cards, codes, and certificates in the App Store
* Display available iTunes account credits in the App Store and iTunes Store
* Save video from Mail and MMS into Camera Roll
* Option to "Save as new clip" when trimming a video on iPhone 3GS
* Better iPhone 3G Wi-Fi performance when Bluetooth is turned on
* Remotely lock iPhone with a passcode via MobileMe
* Use Voice Control on iPhone 3GS with Bluetooth headsets
* Paste phone numbers into the keypad
* Option to use Home button to turn on accessibility features on iPhone 3GS
* Warn when visiting fraudulent websites in Safari (anti-phishing)
* Improved Exchange calendar syncing and invitation handling
* Fixes issue that cause some app icons to display incorrectly
http://www.apple.com/iphone/softwareupdate/
