View Pure is another way to watch Youtube without all the on-screen clutter and dodgy comments. Basically you go to View Pure, enter the URL of a YouTube video and it strips out everything but the video. Very simple to use. You can even drag a button to your desktop which does the job. : http://viewpure.com/
You can also then take the URL of the page you get, and hyperlink to that page. Like this http://viewpure.com/LTCtfT8KFc4 (video is safe for work..and if you haven’t watched it, it’s quite funny!)
It doesn’t moderate the content though, so you still have to use YouTube resources wisely. You will still need a YouTube connection at school though, this is not a way around filtered content. If you can’t access YouTube in school, this will not work.
As an alternative – check out YouTube’s own YouTube XL.