Whats new in iPhone OS 3.1 update

This updates among others includes a new feature called "Genius for Apps". iPhone OS 3.1 with iTunes 9, utilizing the Genius technology introduced in iTunes 8 will be able to make recommendations based on the apps the user already owns through the Genius for Apps feature.

In addition, iPhone OS 3.1 adds the ability to buy and directly download pre-made ringtones. The new offering will launch with 30,000 ringtones from all four major labels, priced at $1.29 each. Accessible via the More tab in the iTunes application, the Ringtones section lets you browse by featured ringtones, top tens, or genres. You can preview any ringtone just as you would a song or purchase it for $1.29, at which point it will be downloaded to your device and appear automatically in Settings -> Sounds -> Ringtone, along with the rest of your ringtones

Finally, iPhone OS 3.1 adds the ability for iPhone 3GS only users to access the Voice Control feature using a Bluetooth headset, the ability to redeem iTunes Gift cards, code, and certificates in the App Store, display iTunes account credits in the App and iTunes Stores, remotely lock an iPhone or iPod touch with a passcode via MobileMe, and a warning when visiting potentially fraudulent websites in Safari.

iPod Touch owners who have paid to upgrade to 3.0 will receive the 3.1 update for free. For those who have an iPod touch but have not yet upgraded to 3.0, can upgrade to 3.1 at a reduced price of $4.95.