Visual search tasks like those in airport security and medical imaging are often easier to perform when the objects are rotating (as opposed to static images). At the same time, it's easy to lose one's orientation when stuff is flying all over the place.
The team at RENCI has come up with a nice way to maintain orientation while leveraging the power of 3D rotation. Check out :58 - 1:32
RENCI Multitouch Footage in HD from Renaissaince Computing Institute on Vimeo.