This ARRL CDROM looks very good.  I think I'll look into adding the repeaters as searchable POI in Overland Navigator.

http://www.arrl.org/catalog/?item=1417

I thought I knew how repeaters worked, and conceptually, I was right. So I figured I'd better read up on what they actually are. I found this document, and it does a good job of showing the concept, as well as quickly giving simple details on how they work.

Repeaters PDF Doc

Repeaters in Google Earth.

Got them from here: http://k5ehx.net/repeaters/qrepeater.php