I watch a lot of them on there and just found tonight that there is a HIGH QUALITY option right under the screen if you actually go to the youtube site.
I have been embedding them here, which I like to do. Does anyone know how to embed the high quality version. There is quite a bit of difference.
Also, if you have a Youtube account and are logged in, you can set the default to always show the higher quality video (so you wont need the &fmt=18 trick) by going here: