You now have the option to watch embedded videos in high quality or HD
(when those formats are available). In addition, the widescreen option
is available when you embed a video. You can use our handy how-to
guide on optimizing your uploads to look their absolute best on
YouTube:

http://www.google.com/support/youtube/bin/answer.py?answer=132460&top...

As always, let us know how you find using this new feature. We'll use
your feedback to make improvements as we roll out new features for
embeds.