
BeatBoxMixer (by verizon) is not only one of the most fluidly animated and coolest designed site I've ever seen but the beatbox films and content is sick!

Papervision is the 3D engine. It started as a simple way to transform MovieClips to achieve the 3D illusion. By changing their position, size, rotation and skew you could almost forgive the lack of perspective.
But the latest version, fully optimised for Flash 8 Image API, uses triangle tesselation to distort textures.

Very nice portfolio website by the japanese web/Graphic designer and illustrator Masaki Hoshino.

Usually, I'm pretty turned off by a flash-based navigation where elements move and/or change size, but it actually works quite well for the work and not work of Chris Erickson.