Popular video sharing site YouTube is testing a new service which allows to view high resolution videos using high speed internet. This feature is currently in testing mode. All you have to do is add a a parameter onto the end of a video's URL (add the &fmt=6 onto the end each url) and you're able to watch it in a higher quality.
For example, The Sights & The Sounds url is
Now add the &fmt=6 onto the end each url to watch high quality video:
Not all videos have been converted at this point.