PaperVision Photo Cube
PaperVision is an open source project to make 3D in Flash much easier than it has been.
I've only had a very quick play, but I was able to create this lovely photo cube very quickly.
It's based on an example on The Flash Blog. I can see a lot of potential for including this in my future flash work. 3D can make things look more impressive, but a sense of space can also make things easier to use.