Before you chuck away that Nintendo DS, here is something you should consider (especially if you use any homebrew flashcards).
According to a member on the Chinese gaming community Hacken.cc, the new Nintendo DSi has rejected all of the ten tested homebrew slot-1 cards. The cartridges tested were the R4DS, EX Flash V, CycloDS, G6 DS Real, M3 DS Real, Supercard DS One, iTouch DS, FCard, NCard, M3 DS Simply and the U2DS.
Source: DS Fanboy