my good buddy jarod put up a cool post about reverse graffiti.  basically some artists that clean away the dirt of a city to make amazing murals.  i think the artwork is tight but i like the message even more.  it brings attention to the filth of a city caused by car exhaust and other pollutants and actually makes the city clean it up.  the video below falls into the category of marketing/advertising that i appreciate.  it promotes the product Clean Works but in a cool way.