It's interesting (and occasionally horrifying) what you can dig up by typing random things into YouTube. I just discovered the beta test of a physics game, Polluted Planet (danger - initially noisy website), which is about cleaning up a level using oil-on-water type particle interactions. It's a pretty clever piece of design, even though it locked up my browser a couple of times during play. Everything requires physics to defeat, and the terrain itself has a rubbery, flexible quality to it.
After the jump, the video that led me to it.