Another one in Middle Tennessee that y'all might like is here:

http://www.bikethecram.com/

Starts in TN, goes up into KY through Mennonite country. Very flat, very pretty. This is the one I picked for my first century. It was well-supported and hit a couple of spots that were pretty nifty. I didn't know there was a Jefferson Davis Memorial Park in KY. Goes thru tiny little towns.