WARNING : Apparently, on many units (this may depend on country variants or language versions) there is a serious problem with this application, damaging the operating system to a point where reflashing the firmware is required. Please be aware of it and only install the application AT YOUR OWN RISK.

Air UI allows you to interact with your Nokia N9 with simple gestures over the front camera without actually touching the device and integrates smoothly with Gallery and Music Player application.

Remember to reboot your N9 after installation.

Ps : It was pulled from Nokia Store, keep an eye till the fix is released ;)

Really sorry about the troubles with Air UI.
We are working on a fix for it... but in the mean time my advice is to uninstall Air UI even if it works fine.