Yes, I'll third the request for info on the games, ebeth.
Descartes' Cove is a "wander around and solve clues" (!) math game that people who have gotten always seem to rave about. It's a virtual world with algebra and geometry and such sort of puzzles to solve. Very problem-solving oriented, not drill-and-kill. I recommend checking out the link if you're interested. They give you all the info you could ever want, including an online video of the game being played so you can really see the sorts of problems as well as the graphics. It's good stuff. It was just too expensive for me at $150 when DS7 isn't quite ready for it yet. But at $112 or $105, I'm a lot more willing to give it a go. I suspect by the end of the year, he might be ready for it, and maybe he'll get there faster if he has this game as incentive!
It sounds like it might be a potential fit for your DS, maybe?
