I mentioned in a couple of the Japan posts, but I absolutely love Osu! Tatakae! Ouendan on the DS. It’s by far the best DS game that I’ve played which really demonstrates to me what a good system it is, even if it can’t match the power of the PSP and probably isn’t as good at the traditional genres. I’ve reviewed it here (of course, you can find it permanently in the review index), so check it out and then buy it. It really is brilliant.