FLIR, the makers of thermal imaging cameras, have released a very cool case for the iPhone which allows you to turn you device into a thermal imaging camera.
The case with a built in camera will sell for $350 and will be available later this year. FLIR cameras traditionally sell for a few thousand dollars, so his case would offer superior value and would be great for home inspectors to contractors or just DIYers.
FLIR is taking reservations for the system now on their website here.