You're right, there isn't one yet. We'll be adding a new index page to display all of the historical hardware charts - it's on the to-do list. I'm sure we can display it by region too (heck we actually track hardware for more places than we show, such as smaller European countries, so maybe we can display some of those too).
That sounds awesome! Final question, I promise. The US pre-order charts, are they done? I know a lot of people found them less exciting, but I liked to use them to gauge hype for titles and track pre-order trends, but I recognize they are software related and probably weren't the most accurate numbers either.