Just make sure you get the latest one, and if you need it for the mmd, make sure you get the latest one released that supports saves. Im not sure where to find it, but if i find it in a while, ill edit this with the link.
http://www.cs.utah.edu/~tew/nesDS/ <-Thats the regular one for any card, but i think you need to use ndstool.exe (bottom of the post)
http://www.megaupload.com/?d=QSISAQLX <- I just uploaded this, its is for mmd save support, and all you need to do to run the roms on this one is put the original roms (i think they're .nes files) without having to go through all the trouble of patching, so you dont need the thing im listing below this.
btw, you gotta place this file inside the folder that has the NESDS.nds file and stuff:
http://darkfader.net/ds/files/ndstool.exe just extract it and paste in in the folder, if you dont do it, you cant use it.
I hope i helped some of you guys out a bit.
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