An Indian U of Maryland physics prof came up with these zero rupee notes that Indians can slip to officials who demand bribes. They've been wildly successful, with a total run over over 1,000,000 notes, and the reports from the field suggest that they shock grafters into honesty. Fifth Pillar is the NGO that produces the notes, and they're available for download in Hindi, Tamil, Telugu, Kannada and Malayalam.

Source:
http://www.boingboing.net/2010/02/05/zero-rupee-note-that.html