My son and a friend did the entire AT in 2006. Started north and went south. It's been a while, but I recall the following:
After a week their feet killed them from being constantly wet. The kid went with Teva Sandals and his buddy wore Crocs. Said it was the ticket and they are more popular than you think.
Regarding gear -
Shared a light weight shelter/tarp type tent with insect screening and supported by hiking poles.
Both carried a couple homemade pop can alcohol stoves (still use them today) and a single two quart aluminum pot each with cup and spoon.
Merino wool long johns and wool stocking cap.
Heavy Wool Sweater.
Single change of shirt and pants.
Couple dry pairs of socks, boxer shorts, ball cap.
Synthetic Mummy Bag and foam pad.
Both raved about hiking sticks.
Balance was food, one quart Nalgene bottle (maybe two, can't remember), phone card since the cell phone was left at home, a notebook, some cord, camera, bug dope and sun screen, alcohol bottle (for stove - usually an empty pint plastic Jim Beam bottle), a couple first aid items including talcum powder, small headlamp, compass (his buddy also carried a gps), trail guide, small Leatherman Juice tool (broke a couple times, he said he would go with a more durable one next time) and a single Bic lighter each.
Always forwarded a "jump box" to the next destination. Recall them "trying" to keep pack weight to 35 pounds maximum.
Might get some ideas here: http://www.trailjournals.com/