The main one hint I can think of is don't wash berries until right before you use them. I keep potatoes, sweet potatoes, onions, shallots.. etc out of the fridge. Fresh herbs. - wash them when you bring them home, wrap in paper towels and store in a ziplock in the fridge. They'll last a week. Tomatoes I keep on the counter for a few days when I bring them home. Avocados I leave out until I cut into them or they get soft and then I put them in the fridge. Most other veggies I keep cold. Fruit I mostly do too, just because I like the taste better.
http://www.5aday.gov has lots of information on vegetables and fruit
http://www.aboutproduce.com is a site they link to that has storage tips, but my browser at work keeps freezing on the site.