I, for one, always enjoy feedback, no matter how far from the original posting date. And, as groobie said, it does prompt me to revisit and discover new ones.
You may also want to check fanfiction.net. Some of the older stories from here are on there (mine and AntiKryptonite's come to mind, as well as other). You can drop feedback directly into the story there if you wish, without it "resurrecting" them the way it would on a message board.
