I would love any more suggestions for DS. He LOVES the Sudoku that someone linked to. He is blazing through selected pages from some first- and second-grade math books I have (he doesn't know money or time, so that's all new). He seems to be doing much better with writing than I thought he would, as long as it's numbers. He's doing fine with second-grade reading comp. I haven't tried him on third-grade yet because he doesn't seem as interested in this.

He seems to really like sitting down and doing "work" and getting that feeling of accomplishment. It is improving his mood. He does this right after school.