yaay just had a go with milkdrop, it was as simple as plug and play on my xp x64, plug my belkin dongle in, wait for windows to install the drivers, sync the wiimote, and when i started the test program it recognized it straight away... makes me sleep easy at night when stuff like that happens
anyway, i have an idea... if there is a way to control the sensitivity of milkdrop's sound reactivity using the wiimote, you could 'reward' the participant with a large reaction on the visuals if they get it right, dance dance revolution-style...
or how about 'transforming' the input of the wiimotes to different frequencies of audio, like long sweeps (large constant acceleration) create high frequency sounds and sudden jerks (large change in acceleration) cause pulses of bass... make it so that when the wiimotes are still, there will be constant white noise, and as the wiimotes feel acceleration, the tone of the sound changes... this can either be fed into the visuals as it is, or mixed with the audio stream for some 'relevance' to the visuals
i dont know how relevant this is, but when i was browsing wikipedia i came across http://en.wikipedia.org/wiki/Linear_response_function
and somehow it reminded me of this thread, can anyone think of anything?