Well, I can't be bothered waiting for that flash to download - I'm on dialup and in the space of 1 minute it only got to 9% - totally unnacceptable.
Anyway, if it is jaw droppingly good, like http://tokyoplastic.com/
it was probably done with Swift 3D or Discreet Plasma. I've used both programs briefly and I much prefer Discreet Plasma for a few reasons:
a) Discreet make 3D Max, which is currently at version 6. They know their s*** when it comes to animation packages.
b) Discreet Plasma is essentially a stripped down version of 3D Max, which means many tutorials that are aimed at 3D Max can be converted to Plasma (to a degree...)
c) Swift 3D has the worst interface of any program of its type that I have used.