The last time I asked yellows8 he replied as pingouin did, so I guess there's no game with that capability yet...Go back and read what I said again.
Not every TWL game is region locked, though.this is not true. access to the sd card slot is shutdown only in case then game doesn't have sd card access bit set in header.Access to the SD card slot is shut down when a game from Slot-1 has been launched.
EDIT: the cartridge version of Art Academy has no access to the SD, only the DSiWare version does...