He found: http://gestureworks.com/features/open-source-gestures/ && http://www.lukew.com/ff/entry.asp?1071 && http://blog.rongeorge.com/design/gesturcons/ && http://gesturecons.com/ (which I didn't know about)
He missed: http://www.kickerstudio.com/blog/2008/12/touchscreen-stencil... && http://mattgemmell.com/2010/07/14/touch-notation/