If you already have a Nintendo DS, you can pick up a SuperCard DS One to play music & homebrew applications. It will also play ROMs, but keep in mind that using it to play ROMs for games you haven't bought is piracy, and it's illegal. Me, I have almost 20 cartridges for my DS, and I got sick of carrying them all around in three cases and switching them out.
With the SuperCard, I can dump them all on a micro-SD card and leave the carts at home. There are a few DS emulators in the works for your PC, as well, and a Google search will give you plenty to play with. More.
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