This is probably old news to most of you, but we have stumbled on to a really cool kids show. It is my eight year old's new favorite.
Even though it is a secular program and touches on biological evolution from time to time, it has lots of good information. What I like about it is that it doesn't present the content in an obnoxious "Bill Nye the Science Guy" sort of way.
Here is a link to the air schedule: Discovery Kids Ultimate Guide to the Awesome
I just wish it was available for sale on DVD!