"Vigilantes" is probably too strong a term -- it's a site for people in Malaysia to post cameraphone pictures of traffic offenders (and of people behaving properly, too, but there aren't nearly as many pictures there). The Malaysian Star notes that the site is operated by the national Traffic Ministry.
This is a nice example of two aspects of the participatory panopticon: (a) it's global; and (b) it makes it far simpler to record (and, possibly, prosecute) petty crimes and deceptions.
(Via Picturephoning)