i like the JS pop up for the featured video column.
agreed.. you should change the
text-decoration: underline to a border underline so it doesn't cut off the 'y' in 'community' for more Web Accessibility info check this site:
http://24ways.org/2007/css-for-accessibility (has that border underline tip in there for example..)
You should get rid of as many tables as possible because they are semantically incorrect (unless used for tabular data) and it would make the site load faster. I.E. Don't think you need a table for the channels column. You've also got some empty td cells that could be removed (using ff web developer outline tables option).
Site syndication is cool you need to get a rss feeder going so aggregators can read the latest videos or something..
If you think users want a video with sound to play when they first go to your site then keep that feature if not then make the user activate it because you cant assume the user wants sound playing. It would be strange to mute a video and keep it playing.. For example i was listening to music and i heard a computer game playing so i had to pause or even close your site down so i could hear my music..
I would recommend you watch this chaps website:
http://www.trakr.co.uk/
It is still in beta but you can read the pdf proposal by clicking this link:
trakr proposal