Robert Hodgin of The Barbarian Group (makers of iTunes visualizer Magnetosphere), presented a movie (pictured left) at "Flash in the Can" in Toronto earlier this year.
He talks about the Processing environment and his use of 3D Perlin noise for flocking. Flash people were quick to experiment after an earlier presentation on Perlin noise; here's one, Animated Perlin Clouds in Papervision3D.
There's a bunch more generative processing stuff around beside the recent video by Radiohead. Toolbox is a node-based generative editor app that was featured recently on Create Digital Motion, which also features regular write ups on Processing projects. You can find demo movies of Toolbox on Vimeo, where the programmer links to Vector Field animations that do not use Perlin noise (implemented in After Effects in the Fractal Noise filter).