I love lists. ScoutLists is a simple little web site that will build a packing list for your chosen activity and weather. It is a good starting point although like most camping lists it misses the one item I think is forgotten and under-rated more than any other - a packable nylon hammock.
Take a hammock with you and you can use it for sleeping, trapping fish in a stream, trapping birds in a flyway, trapping rabbits on a trail, a rescue sling, or most importantly, even an emergency badminton net.