Hi, I just finished my first NDS project : Quick & Dirty Save Manager for Supercard
As its name says, it's a save manager for Supercard (SD&CF, maybe M3 as well) ^^
you can:
-create multiple save for a game (up to 9)
-change the current save for a game
-create a new empty save for a game
-copy the current save to a new one
-erase a save
it's a little slow, but it's due to the write function of the FAT lib which is slow (or if you know a way to write on sd/cf faster, let me know)
It was made in 3 days, so do a backup of your saves before trying...
let me know if you find bugs.