I've been a fan of Overheard in New York for a while. At some point, it occurred to me that each quote has a pretty precise location attached to it and that it would be cool to plot all of them on a map. I eventually got motivated enough to actually do it. The result is overplot, a Google Maps API-powered visualization of all of the quotes I could get my hands on.
L. Vieira. Proceedings of the IX Brazilian Symposium on Computer Games and Digital Entertainment, page 244-247. Brazilian Computer Society, (November 2010)