Apologies for bumping this when there's already a thread on the front page, but swish, I am so Nostradamus.
Something that plugs into the GBA slot, giving you 5 buttons to press, plus decent grip. Strumming via the stylus.
thought i'd bump this thread as guitar hero ds seems to be coming out next year. Thought i'd start the speculation of how it would work as they plan to use a peripheral. Also whether or not it would be any good and if the DS could find a use as a controller for the wii version.