One missing feature, however, is the ability to stream content from an iOS device to either another iOS device or a Mac or PC. At the moment, iOS devices are limited to being Home Sharing clients, not servers; adding that server functionality would be handy for cases where you want to share music or videos from your iPhone or iPad with friends.

That said, if you have an Apple TV or AirPort Express, there is another option: AirPlay.

AirPlay debuted and iTunes 10--like Home Sharing, it's a blanket term for several technologies, one of which is replacing the old AirTunes feature that let you stream music from your Mac or PC's iTunes library to Apple TVs and AirPort Express devices. AirPlay extended that, however, by letting you stream audio to those aforementioned devices directly from your iPhone, iPad, or iPod touch, and even in some cases adding video-streaming support.

In iOS 4.3, AirPlay gets further beefed up with the ability to stream video from compatible Websites, third-party applications, and the Photos app. So if you want to show off that HD movie you just shot on your iPhone 4, you can stream it to your Apple TV with the tap of a button. Plus you can take advantage of all the slideshow transitions on the Apple TV; in order to do that, you'll need to hit the AirPlay button while viewing a photo and then hit the Play button to choose your slideshow transition from the Apple TV's list.