I did iMovie and some FCE on a iMac 17" 800 MHz. When I stream my movie from my Sony camcorder to iMovie/FCE, I do get some dropped frames. About two or three in an about 30 minutes of DV. When I find a dropped frame, I just streamed that part from the camcorder again. That fixes the problem, but yeah it's annoying. The iMac only has 256 MB of RAM though. Hopefully my Mac mini won't have that problem with 1 GB RAM!