rkimble,
Are you looking for mountain bike trails? Or roads to ride?
If you're looking for mtb trails, and/or people to ride with in the Nashville area - check out
www.NashvilleMountainBike.com and the message board there! Lots of people to get hooked up for rides, info, etc...There are many trails in the Nashville area, all within less than an hour's drive.
Hamilton Creek is right in the city limits and is one the most techy trails in the area.