I exported it as an AVI using the AVI plugin (which uses some really funky codec... if anyone uses it, one tip is to make sure your image size is divisible by 2 in both directions).

virtualdub would read it, so I piped it through avisynth, then used virtual dub to convert it to a divx.

In you are interested, the result is here:
http://ffaat.pointclark.net/incoming/test-divx.avi

-Rob A>