According to Kotaku, DSi Point cards are invalid for the 3DS shop. Of course, Kotaku blows this out of proportion. Did anybody really expect the DSi Points to have any relation to the 3DS? I didn't. It's a whole new system, with a whole new shop system. Of course, if you (for no reason at all) purchased 150 separate point cards in preparation for the 3DS, then you have my sympathy.