We have had great success this school year using documentaries (and some fictional movies) to learn about history. And despite the number of print resources I've found on evolution, I'm having trouble finding a way to go over this material together with the kids. So I did a quick search for a document series and came up with the 8-part DVD set from PBS. I've got it on reserve at the library, so after we watch it I'll put a quickie review on the link at my Amazon store. But from the reviews I've already read, it looks perfect for our purposes.
In the meantime, there's a companion website at PBS with web activities, video clips and more.