I bet the iPhone app will be great. A few months ago I had some weekend fun implementing this algorithm in a trow-away iPhone application, and indeed I was able

I bet the iPhone app will be great. A few months ago I had some weekend fun implementing this algorithm in a trow-away iPhone application, and indeed I was able to observe the color change in my skin, and when watching to the veins of my arm the movement was greatly amplified. I was missing a lot of the filtering required in order to amplify more and performance was a bit poor (frame rate) since it was just an hack. Something like that done in the proper way will be cool.