Watch Youtube Without Distractions: QuieTube

Quietube is a new cool browser bookmarlet which can grab any youtube video and put it on a blank webpage removing all comments and crap, just drag a button to your browser’s bookmarks bar. To do this, you simply add its bookmarklet to your browser’s bookmarks toolbar, and click it on any YouTube page.

See Also: Download youtube videos | Top 10 tools

All in all, quite a practical service that many will take a liking to. If you are looking into a different way to experience YouTube, just give the site a spin and see whether it delivers the goods or not.
Check quietube here