I'm testing video uploads on Vox - they work! This is a (meaningless) test Quicktime movie, shot with my new MacBook's built-in iSight using the free Quicktime Broadcaster and saving to the Apple intermediate codec at 320x240. That codec seems to be the only one that can capture isight video in high quality at 30fps, even at 640x480.
I then opened the resulting MOV file in Quicktime Pro ($30 from Apple) and exported it as an MP4. Seems to have worked. Now that I can do it easily I can use the iSight to videoblog.
Sorry it's such a stupid video. I was experimenting on the plane home and was too embarassed to actually say anything with people around. Next time I'll take it into the plane's bathroom. Or maybe not.