Yeah, I used to follow amazon.jp's rankings pretty fervently too. Haven't done it for a while.
I think it would be worth dividing up into games that aren't out yet/games that have released. Because they seem to have different scales of popularity. I've seen a first page (top #16 games) with about 2 released titles and ~12 or so pre-orders before, so whatever measure of popularity amazon uses, it definitely seems to favour stuff which isn't out yet based on ranking.
The hardware chart is cool though. I never used to scroll far enough to see where the consoles got to.







