This is working, for now, and I am very tickled with how well it integrates video into eChalk.com. Our district uses eChalk.com's email and web hosting services. I have been experimenting with several strategies so we can display video projects our students have created. We liked .MAC because it is so easy to post the videos to their server and the .MAC servers load and efficiently play-back the videos.
I like having our videos hosted on Google video, because once they are uploaded, all I have to do is copy the code generated automatically by Google Video and paste it into a page on our eChalk website. Our content filters do not block this embedded HTML code. Basically, it works!