Nintendo's DSi may have just launched, but if you figured your wallet would be safe from buying any other related hardware in the near future, you clearly aren't in tune with the rabid peripheral market. Our best buds over at Joystiq sat down with David Young, the assistant PR manager for Nintendo of America, in order to talk shop and get a glimpse into the DSi's future. Of note, Mr. Young stated that DSi interaction with the Wii was "certainly a possibility," but he failed to elaborate much beyond that. What he did confess, however, was that the DSi will soon be interacting with a pair of pedometers (or "activity