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TED talks/videos can be a great source of free classroom or individual student enrichment. Naturally, use with caution. TED materials are typically most appropriate for upper grade levels, but expecially visual presentations could be repurposed for the lower grade levels.

A blog written by Ted Klug, technology coordinator for Lakeside Lutheran High School. The blog is designed to inform teachers on free or cheap technology tools that are floating around out there in cyberspace.

A teacher's story of how pre-class video lectures are making a huge difference for AP Calc students.

I really like this approach especially with topics that students will have difficulty getting help with at home. Sal Khan is a big supporter of the backwards/flip method too: http://www.ted.com/talks/salman_khan_let_s_use_video_to_reinvent_education.html