How do I post Alice Videos on YouTube?

I'm thinking about moving some Alice classroom demo videos from my server to YouTube to free up some space on my server.

I have never posted anything on YouTube.

Some of the videos on YouTube are of very poor quality. See for example the video at http://www.youtube.com/watch?v=XVaFHVEQTnY

I certainly don't want my Alice videos to look like that one. Any tips or suggestions on how to best preserve video quality when recording and later posting videos of running Alice worlds on YouTube would be appreciated.

Dick Baldwin
Free Alice tutorials: http://www.dickbaldwin.com/tocalice.htm
Free programming tutorials: http://www.dickbaldwin.com/toc.htm