We've got to tip our hats to Bacteria for this one. A portable (although, you can easily argue just how portable the thing is) multi-platform handheld mod? Ambitious task, which hasn't been fully realized, yet enough progress has been made for us to realize that we have neither the technical know-how or guts to even attempt a project such as this. That doesn't mean we don't love checking out these kinds of mods.
For a video, as well as a detailed account of the creation, hit up Bacteria's website here.