Apple has just released an update that fixes the security flaw in the operating system for all its devices. Other than the security update to fix the problem, it doesn't look like it brings any new features to iOS (we'll have to wait for iOS 5 for that). To update your iOS device, just plug it into your computer, run iTunes and follow the onscreen instructions. The update (iOS 4.3.4) is available for the GSM iPhone 4, iPhone 3GS, iPad 2, iPad, third and the fourth generation iPod Touch. For CDMA iPhone 4 users, the same update is labelled iOS 4.2.9 instead.
source: Ubergizmo