I've put the recent Khan Academy videos in a channel [video]

The site is in beta now. Letting viewers to create their own channels and own feeds is in the plan. There are two areas of viewer customization. One is to create viewer's own channel list, assigning the channels to the backend video feeds. This allows the viewer to narrow from hundreds of channels down to a dozens of favorites. Another area is to let registered user create video feeds from Youtube, mixing and matching videos. The new feed can then be assigned to a viewer's channel.

I'd love to hear any feedback or suggestion as I'll go ahead to build the rest of the site.