How about an attach rate chart?

[Entroper]

Auriel said: How bout adding all sales to date on a console and then dividing that by the total number of consoles sold to date. Not a hard thing to do when you have Excel or equivalent.

Like this? http://entroper.no-ip.org/Pictures/SoftwareAttachRates.png The "Wii SW(2)" column is sales of Wii software with Wii Sports subtracted, so that the attach rate reflects actual software SKUs purchased. I'll do one for Japan if there's enough interest. EDIT: Picture was too big, posted a link instead.