Since I use Flash on the site to deliver animations (some of which are large downloads) I recently made a flash preloader animation - almost 100 frames, it was modelled and animated by hand using my raytracer, Arise. Of course, given the fact that it's made from rendered frames it doesn't really stretch the flash skills very much but there is some basic action programming when it's used as a preloader, to loop the can opener segment until the entire movie is downloaded.