If you look at the US data you will see the attach ration between the DS and PSP is nearly the same.European data we dont have really reliable data except for UK.And in Japan the PSP games sell quiet well ,but it has fewer games and it hasnt managed to have 4-5 titles with enourmous legs (to the point they keep selling 3 years later) as the BT,Mario Kart and New Super Mario games.