Nintendo has never disclosed the extent to which it uses currency hedging. Historically, when the dollar tanks, so have Nintendo earnings. A weak yen ought to help Nintendo earnings, since the bulk of the sales are in the US. It could be good timing for Nintendo shareholders since the 3DS is coming out and (maybe) Nintendo has finally fixed the piracy issue. The stock could be a good short term buy, but it won't make up for the clueless management.