Scholastic Study Jams- Scholastic's free version. They have really cool karaoke vidoes
Science NetLinks- Free hands-on science lessons & activities
History of Laundry- Ok, I know you are "thinking what in the world?!" but this is a really neat site with videos from Proctor and Gamble. It really does a great job of tracing history (hello social studies standards- long ago vs. modern times!) Great inventions highlighted as well.