You may have heard some of the noise that EFF was making a year so ago about the tracking dots hidden in documents by color laser printers. A number of people contacted their printer manufacturers to ask how to turn the "feature" off. At least one person (who has, understandably I think, expressed interest in remaining anonymous) was subsequently visited by the United States Secret Service who asked him questions about why he wanted to turn off the tracking dots in his printer.
I've put up a little website with some others in my research group at MIT that tries to organize individuals to call into their printer manufacturers and demand that the feature is turned off. If many people call, the government won't be able to visit us all.
We've made a long list of technical support contacts to help with the process. Please call your printer manufacturer today and spread the word about the site so that more people call in.
The site is called Seeing Yellow -- a reference to tiny yellow dots that make up the tracking code -- and its online at seeingyellow.com.
