Whoops, forgot about the other corrections: NTSC = 29.97 FPS. MPEG-1 can be basically whatever you want it to be, but the specification for NTSC MPEG-1 is 29.97fps (or 30fps), 352x240,44.1khz Mpeg-layer II audio. As a few have mentioned, it depends on what your target audience is of course. However, if you're going to be putting this on video or burning to a DVD, you need to render to 60 FIELDS per second for NTSC. This is very important for video. If you have a video capture card, you can normally choose it's codec and the fields will be rendered automatically. For exclusive playback on a computer I encode to 30fps. 15 is the bare minimum for decent looking playback, I don't really even care for it. I typically encode to Mpeg (I or II), Indeo 5.11 AVI, or sometimes QT. -Tim (1 of the 12: co-founder)