i figured i should post a finished project now and then.
Video at: Glance on Vimeo
This piece uses pulses from the DVD player audio line, run through an amp and rectifier circuit, to an optocoupler input to sync the video with the arduino. Used a Pro Mini to manage both otherwise independent systems.
Also, i was lucky enough to get it posted on the Make blog today: http://blog.makezine.com/
wild!
A tad creepy for me, but very cool. May I ask what your inspiration was?
but creepy in a good way, right? 
inspiration is always a hard thing to say for me. i was just thinking about peoples' interactions, as well as our perception of volition/intent on the part of mechanical things, and this was the result!
This is real art from technology. There is an undeniable level of tension between those two. I felt like they were in some odd moment of silence during a heated argument. Nice work! I'd love to see what this can do with more variations.