Also, the SNES emulator for GBA is leaps and bounds better than the one for DS. So if you have the funds (and you care to play SNES), get one of those cards as well.
http://en.wikipedia.org/wiki/Nintendo_DS_storage_devices#YushenDS_Card.2C_R4DS.2C_M3_DS_Simply.2C_and_their_clonesthats retarded, other brands havetheir own software.
Forget about the R4, they stopped releasing firmware.
Get yourself a CycloDS Revolution.
I previously owned a DSTT, and switch to the Cyclo a few months back.
Also you want to get an EZ Flash V 3-1 for slot2, which will add RAM for web browsing, rumble function, and GBA rom support.