Apple have just released iOS 4.3 for the iPhone, iPod touch, iPad. You can download the new firmware with the links below. The new features among many are wireless hotspot which allows you to share your 3g connection with anyone through wireless(iPhone 4 only). There is also photo booth aswell, which adds a few camera effects you can ad to pictures taken.
Remember you need iTunes 10.2.1 to install this new firmware.