I just read an article on Larry Ferlazzo's blog about how to get around your district's blocking of YouTube. This is a problem for many teachers. There are good reasons to keep YouTube blocked, but at the same time there is so much good content there. This was obvious during the election when Obama was posting videos on YouTube, and his transition team continues to do so.
Larry's article led me to a blog post by Joyce Valenza on the School Library Journal blog called When YouTube is Blocked (eight ways around). Larry suggests bookmarking this article, and I agree. There will be that time when the perfect video that you or one of your students needs for a presentation, and this article will help you download it and convert it to a format you can play from your laptop or from within a PowerPoint.
Joyce also suggests trying other video sites that may not be blocked. TeacherTube is one that many teachers know about, but Larry suggests EduBlogs TV, which is still in beta, but is hosting educational videos, and Larry says he has used it quite a bit in teaching American History. The list of videos on the home page looks intriguing, however, I can't get any of them to play from work. Maybe they are embedded videos from YouTube? In which case. this doesn't not solve the problem.