This project looks very intersting. It was started by the people that put together Fuse Kit. Which was an excellent project.
http://labs.adobe.com/wiki/index.php/Talk:Pixel_Bender_Toolkit
A very interesting idea, ripe with possibilities.
http://www.gskinner.com/blog/archives/2008/12/gtween_beta_3_t.html
Another tweening engine.