What should I use it for on my M3 DS Simply? I already have a 1 gig MSD that's working awesomely, but I feel like I want to use this one too, and I don't know what to use it for. "Pictures"? Games? Homebrew? Something else? Or should I just use it as a backup card? Also, the only thing slot-2 cards have over slot-1's are the ability to play GBA games, right?