Very true, but the DS still makes older handhelds look pathetic in sales. Only when you combine Gameboys with Gameboy Color, which is a more significant difference than those between DS models, do you have anything that compares to DS. Undoubtedly DS will vastly outsell those two combined by the end of it's life unless it's cut short by it's successor.
Gameboy had much less appeal to adults though.
A game I'm developing with some friends:
www.xnagg.com/zombieasteroids/publish.htm
It is largely a technical exercise but feedback is appreciated.