DNA Tube is a nice site for watching and sharing videos about topics in science. While most of the videos seem to be about topics related to biology there are also videos about chemistry, physics, and computer science. The videos are a mix of animated, narrated demonstrations and lecture videos. You can search DNA Tube using keywords or browse the categories to find videos. The videos can be embedded into your blog or website and if you register on the site you can download videos.

H/T to Michael Zimmer for the link.

Applications for Education
DNA Tube could be a great resource for science teachers and their students. The lecture videos could appeal to people who want to get in-depth information about a topic or series of topics. The shorter demonstration videos could be useful supplements to a classroom lecture or lesson.