I feel like a purist reading this thread. First, let me say that this topic has filled volumes, and without a more specific directive as to what you are looking for, it's really impossible to 'improve' on a stock that is'nt defined by purpose or type. I believe that's why this thread has become so unwieldy. That being said, I would follow AAQuesada's post for basics in terms of how to judge a stock. I always make my stock ( white or brown ) as pure as possible, as you can always infuse other flavors later. I want my stock to taste like Chicken, so I don't mix Beef or other poultry. For bright I use whole organic Capons without the breasts, for dark stock I use backs and necks baked. A few points. I think there are basically two types of stock - bright or rich, and there are many techniques to get there. I've written a little about this and provided examples at www.thewonderkitchen.com in a tutorial called 'Deep Chicken Stock'. My technique is to formulate a remoulage and use this in a circular fashion with my stock making, so I always have 3 - 4 different strength stocks in the freezer. Maybe overkill for some, but it certainly provides the flexibility I need. I hope it helps.