i think the biggest problem is what data in this is actually relevant. to me market share should be the total $s spent on graphics cards, and where they went. but even then some issues can come up if you buy a motherboard with built in graphics, then put in a pcie card, does it count at 2? or what about people who go Xfire/sli instead of buying an X2 card, does that count as 2 vs 1.

too many unknown factors to call this a good article, or any decent analysis