You may have seen our Chrome OS tablet concepts from last Monday; in the video, some floating hands interact with a touch surface. We only used one hand image instead of showing the full range of gestures, but I did make a larger set:
To make it just a little bit easier for everyone to create quick mockups for touch UIs, I made a PSD containing the full range of hands, which you can download (7MB zipped) - the hands are at a pretty high resolution, and are lit by small amount of screen lighting coming from underneath them (because I just took photos of my hands against my home computer's monitor).
