Just a quick entry to say that I've stumbled across a few more websites of interest for the old earth viewpoint. This blog - http://oldearthcreationism.blogspot.com - is exactly what I was looking for! The author has grade-level lists of curriculum for science that are "old-earth" friendly! I have just barely begun to look into her blog, but I think I will find a lot of useful information there.
Also, by following a few links, I found these websites as well:
I have not looked at them in any depth, but they seem very interesting, and were recommended by several other sites. Both appear to have content about integrating science with the Bible.
A few more links:
http://geochristian.wordpress.com/ - mostly geology, but also general science from a Christian viewpoint
http://asa3online.org/homeschool/ - not much content yet, but it sounds like they may have some soon (their parent site: http://asa3.org/)