NeoK12 is a great collection of educational videos for science, math, social studies, and language arts. Each category is subdivided by topic. For example under the social studies heading you will find sub-categories of geography, government, industry and several more topics. Most of the videos come from YouTube or Metacafe. You could find these videos yourself on YouTube, but NeoK12 saves you time through their categorization of videos.

Applications for Education
Most of the videos on NeoK12 come from YouTube which may be a problem for those who work in school districts where YouTube is blocked. If YouTube is not blocked in your school, NeoK12 could be a valuable time-saver in your search for educational videos.

Here are some related resources that may be of interest to you:
Can’t Use YouTube? Try This
20+ Educational Alternatives to YouTube
Six More Educational Alternatives to YouTube
Quietube – No Nonsense YouTube Viewing
Two Good Options for Subtitling Videos