I've been tweaking around with the arduino playing with the AMAZING Mozzi library which does some great audio/synth stuff...it's very cool, I'm trying to split my tinker time a few ways at the moment so, although playing with this is great, I'm also working slowly through the documentation that takes you through all the different aspects of the library. Its slow progress...I do seem to have a luddite brain when it comes to code!!
The video is of one of the example sketches from the mozzi library very slightly tweaked...and yes light dependant resistors are cool!!