A podcast on counting. Kids with younger siblings get a big kick out of it because it talks about how children develop a number sense. Also talks about the importance of mathematics in everyday life. I use it during my unit on logarithms.
"Imagine hundreds of thousands of great short videos, and other media, explaining every topic taught to school kids. Imagine them rated and sorted into a giant Directory, making them simple to find. WatchKnow--as in, "You watch, you know"--is a non-profit online community devoted to this goal. "