I saw those percentages marked on chocolate wrappers, and I just didn't get it. I'm going to check out that website you mentioned. Thanks.
But first, drop everything and go buy a bar of Lindt 70%. It's about 2 bucks at the drug store, and now they even have a smaller bar on the rack with all the other crappy candy bars. A little goes a long way, and a big bar lasts me about 4 days. It is a very satisfying chocolate experience.