The top 10 from both services, complete with thumbnails would indeed be very cool. I look forward to someone producing some code ;-). From a strain-on-the-server point of view, it'd be better to convert them once and make the results available rather than lots of people encoding them all separately.

As for email notification, I'll investigate that later today.

The Flash video oddness seems to be specific to the x64 platform. I'll raise it on the ffmpeg list.