Smithsonian Kids

http://www.si.edu/Kids/

Build a Sod House, See an animated skeleton of a Triceratops walk. This is a very cool site.

NeoK12

http://www.neok12.com/

This is AWESOME! When looking for videos, I typically have looked to www.unitedstreaming.com which is part of Discovery Education. I probably would still check there but this is an excellent bonus resource. The reason I like this website is twofold. First, all subjects are outlined on the homepage. Second, all videos are categorized by grade level and reviewed by teachers.

Escape of Jane- A True Story of the Underground Railroad

http://www.cmonline.com/boson/freebies/escape/escape.html

This is a fictionalized account of an actual happening in 1843. It could easily be converted into reader's theatre.