I'm going to try the video sales letter vs sales letter on a small project this thursday and I will share the results here.

When I did seocodebreaker I used a Iframe but the video was set to load and play, the problem was trying to load a 25mb video is hard for a lot of people. So I changed it to and jpg and then if they click the jpg the video will open in a new window and start playing. I found this works much better if you are going to have a video with a sales letter and the video is big.

Also I love Amazon S3 storage, it dose take the firefox pluging but the bandwith is cheap and I have never had any trouble with it at all. Plus is a cheap way to have a safe backup of your other file.

Thanks
Charles