These links have been helpful to us in planning trips, finding cool gear or were just interesting.
Gear
REI is one of the best sources for equipment and information.
Sierra Trading Post is an online source of all types of gear usually priced well.
Hennessey Hammocks makes my favorite piece of backpacking gear.
MSR manufactures quite a few good products. We use their stoves and water purification systems.
A good resource for product comparisons and other info:
http://www.backpacking.net/

Government information and park resources
A comprehensive listing of Tennessee State Parks:
http://www.state.tn.us/environment/parks/
Info on the Smoky Mountains:
http://www.nps.gov/grsm/index.htm
Appalachian Trail Info:
http://whiteblaze.net/
Friends of South Cumberland is a fantastic non-profit organization. They do great work for the park and are an important source of information:
http://www.friendsofscsra.org/index.html
A good list of a number of hiking clubs in Tennessee:
www.hikingandbackpacking.com/tennesseeclubs.html
Peer reviews of a number of Tennessee trails:
http://www.thebackpacker.com/trails/tn/trails.php