Excellent! This update should help a lot. Of course there will be other issues caused by this update (e.g., hardware/accessories that fall into multiple categories). Could I make a suggestion? How about breaking the categories into sections and subsections? We could have Nintendo 64 [NA] as a section, which would contain games, hardware, and maybe accessories. Hell, you could have Nintendo 64 as a main section, then put Nintendo 64 [PAL], Nintendo 64 [NTSC], etc. after that.
One more thing: My long platform list is a little inconsistent. I have Nintendo DS, Nintendo 3DS, and Nintendo 64, then I have DSiWare up top and Super Nintendo and Wii at the bottom. Maybe it's better this way, but I would enjoy seeing them all together and happy.