I want to make it perfectly clear that I am not condoning these actions.
That being said, Boing Boing has an interesting post on how to get free copies from Canon copiers; the same type of copiers that are generally used at your neighborhood Kinkos.
Watch how this information spreads virally among different web sources and blogs. Will copy shops be aware that everyone knows how to hack their machines? Will the workaround for the new copy shop fix be just as easy to hack? Certainly the hack for the new fix will be disseminated just as easily.