YouTube recently announced they will allow users to embed HD and Widescreen videos.  Now your embedded YouTube videos can be in the HD format, making your widescreen videos looks even more crystal clear.  They have even written a how-to guide on optimizing your uploads.

Fortunately all your past YouTube embeds will not be effected.  But as far as any future embedded videos?  They can all be in HD, Widescreen and even better show off the videos you mean to show.