Opera; A couple of things glossed over about Particle Illusion: 1) If you have a .avi of your intended video, you can input it as the background and adjust your effects on a frame by frame basis, then output the two as a composite. 2) PI also supports multi-channel output (alpha, Zdepth, etc), for use in the better compositers. 3) There are several libraries of effects for free download from the PI site, and you can learn a lot by examining them and tweaking the values. 4) The demo =DOES NOT= do the actual program justice. The library included is more toy effects than anything, much of the actual capability of the program is locked or disabled (no adjustment of the emitters, for example).