(copied from my YouTube blog comment)

I like the idea of a Widescreen player, but I think this one is just a
bit too big. Also, I uploaded some videos in 16:9 ratio a while back,
but they appear to have been converted to 4:3. And then there some
videos that I filmed in 16:9 that I converted to 4:3 myself, because
it wasn't 'supported' back then. This results in those videos having a
huge black border completely around them.