What's the best way to deliver super slow-motion video to the browser?

This seems to me to be a special case, because with super slow-mo video (such as 10,000 frames per second) the visual difference from frame to frame is minimal. As such, it's easy to compress highly.

Please suggest codecs, as well as encoding software, backend software, software configuration tips, and services like youtube.

My goal is to get about 100 frames of QVGA video to the browser in 500KB. By the way, remember that Radiohead In Rainbows site?