We pretty much figured that Nintendo had another reason for releasing the DSi other than just wanting to give us a prettier system like, say, wanting to stop rampant global piracy on the DS. Now that the DSi is out in Japan, the public has tested all of the flash card piracy devices and found the results to be very, very bad. None of them work.
R4 - Failed
EZ Flash V - Failed
CycloDS - Failed
G6 DS Real - Failed
M3 DS Real - Failed
Supercard DS One - Failed
iTouch DS - Failed
FCard - Failed
NCard - Failed
M3 DS Simply - Failed
U2DS - Failed
It's possible that there's a card not currently on that list, but from our quick glance, all the big boys in DS piracy are covered.