Website with tons of math and physics resources shared through a community. This site will give you the best physics and math multimedia on the web in one place. The partners are MIT OpenCourseware and Stony Brook University. This is another way to mashup content and how material is becoming more open
This search engine is intended to be for students and has widgets and add ins for web browsers. The websites that are returned in this engine have been evaluated by "research experts." In this case, you have a curated sort of search.