ScienceHack.com - Search Engine for Science Videos

ScienceHack is what those in the biz would call a vertical search engine, I think. They index videos from other sites (such as YouTube and MetaCafe) to cater to a particular niche -- in this case, science videos.

This is to help refine searches and avoid the over-broad results you can get from the traditional search engines, or so they say. It can also be helpful to find videos in your category of interest in one place. Every video on this site is screened by a scientist (a university student or a university graduate with a major in a science related field). Suggesting that you look up terms such as hubble, space or Rubik"s cube, the site is currently limited to issues related to physics, chemistry and space. Although I must note that when I tried to enter "Einstein," the grand poobah of physics, there was no results found.