AirView is a free iOS app that lets you send video wirelessly between iOS devices, and from iTunes to iPhones and iPads.

The app does this by tapping into Apple's AirPlay, the technology introduced in iOS 4.2 that lets you send music and movies from your iPhone to compatible devices. Up until now, "compatible devices" has meant either the AirPort Express router, the AppleTV v2 and a handful of third-party stereos.

Run the AirView app on any iOS device and it will then show up on your Wi-Fi network as a new destination for video, just like any other, and you'll be able to choose it in the pop up list in iTunes or another iOS device. This lets you stream from iTunes to an iPad (previously impossible), or to send a movie from your iPhone to your friend's iPad when you go visit.

It works perfectly in testing, with one big caveat: the app is for video-only. You can't stream audio (although movie audio is transmitted, of course). This means you can't use an old, broken iPod Touch as a makeshift AirPort Express. Not yet, anyway.

It's worth grabbing this one now, as you never know when you may need it, it's free, and it's only 400k in size.

Also worth a mention is AirFoil, a well-established Mac (and now Windows) application from Rogue Amoeba which lets you stream any audio from a Mac (not just from iTunes) to an Airport Express or iOS device. That costs $25.

AirView product page [iTunes]

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