Little Sound DJ
I was pretty intrigued by this a few years ago and then again when Trash80 released the Dirtywave M8. I have a Nintendo DS that I have had forever to play Mario Kart on with my wife while sitting on the couch (we each have one). In order to load ROMs on the NDS I have a DSTT card that takes micro SD cards.
I loaded Lameboy emulator on the DSTT and used it to boot LSDJ.

This is pretty cool. I can’t remember how to use LSDJ but I remember it being a huge influence on the M8 (at least the UI and navigation).