Hormel (yes, the SPAM folks) of all people actually have a remarkably extensive site on apple cultivars as well as information on how to cook them. They have other fruit pages as well, though they hardly compare to the apple one.
Makes me really want to bake an apple pie. Really. Like I nearly packed up the infant, drove the van across town to the grocery store, bought the necessary ingredients (including apples...I think we have one elderly 'Gala' in the fridge at the moment), came back, and started cooking, at 2:30 in the morning. Nearly. Perhaps tomorrow night.