This is a homebrew that simulates the 3DS AR card pack on your DS (or PSP). I know it's a little early but I wanted to get my contribution in before somebody else thinks of it first (some guy has already done this on Android).
So go ahead and download to check it out! It's free so you can't complain!
http://filetrip.net/f24475-ARcardPACK-1-0.html
http://filetrip.net/f24475-ARcardPACK-1-0.html