DSi cards
There is a lot of speculation before the release of the DSi here in the United states. We already know that they are not compatible with current generation M3 ds roms because Nintendo is trying to stamp out the progress. Still, there is no telling if the new kinds of cards that are prevalent in Japan will also be disabled for the US release of the Nintendo DSi. I doubt that Nintendo will bother at this point seeing as how their efforts are obviously futile. Every time Nintendo puts up new protection, hackers are able to bypass it usually within days.
