Been a uni the past few days. About 4 of the guys in the comp sci course have 3ds's, we always get each others each day so streetquest will go fast. Puzzle quest is a bit of a pain though.
Amadeus from DSlinux was making a GUI (hes no-longer a part of it)
http://www.dslinux.org/f0rums/viewtopic.ph...198&start=0
If it was possible with the original ds, i don't see why you couldn't do it with the dsi.(once homebrew is ready)