well i downloaded it from here:
the one labeled
dslinux.ds.gba (for GBA flash, G6, SuperCard-SD, M3-SD, iDeaS if you rename it with a .pme extension)
and so i run it... and it asks for my nintendo login so i put it in then hit enter. then it asks for a password, and i try to punch it in... but nothing happens. i hit the letter but it doesn't show up on the screen it does nothing....
so ya that and.. what else can dslinux do?