Here's the kind of project we wish we'd thought of. Alexis Lloyd, a student at Parsons, put together a website called Adscape as part of her MFA in Design. She went to three neighborhoods (East Harlem, SoHo and the Upper East Side) and in a five block section recorded every bit of advertising she could spot (beyond storefront signs). She then divided all of the ads she photographed by subject and put them all together online.
And if that's not enough for you, Gothamist on advertecture.
Photograph by Alexis Lloyd.