Trapcode released another cool After Effects filter today. Form "is a grid-based 3D particle system with a twist. It can be used to create fluid, organic patterns, complex geometric structures and swirling strings. Using other layers as maps for various properties provides endless possibilities," as does controls for audio visualization and easy seamless loops. Form ships with 61 presets and built-in help.
Check out the fun demo movies and see how Form works at Form in action. There's 3 more Peder Norby tutorials at Red Giant).
Update: Form beta testers are already posting examples on Trapcoode People, and Harry Franks posted a coupla presets on AE Freemart.