Not sure how many of you actually noticed this, but as of today, all YouTube videos play in widescreen. While the embed versions will retain their square frames, on videos viewed on YouTube itself are in a fancy widescreen format. And I have to say, it really helps for things like our recently posted Star Trek trailer, amungst other widescreen content. But don't fret, if any videos were not widescreen to begin with, they'll now have black bars along the top/bottom and/or sides.
Good to know they've tried to make the viewing experience better for everyone instead of letting certain channels get "theater mode".