Looks good. I see you also added the 50MB max file size, an important parameter. If I recall, the videos are downloaded by the voters, rather than streamed. I'm planning to use wmv (on the list in the rules and pretty good, IMHO) for a 1-2 minute animation, and adjust the quality/compression to get it under 50MB. A quick Google search makes it look like wmv movies can be easily imported to Quicktime via various free convertors/players for the Mac. Does that sound reasonable to the Mac users here?

http://www.aimersoft.com/convert-wmv/play-wmv-on-mac-free.html