I found this Google mashup map kind of interesting. The interface is somewhat clunky, and only a small selection of metropolitan areas are available, but the idea can stand in for a lot of what's happening on the web right now. That is, by combining dynamic sources of social or user-generated information in "on-the-fly" representations, in this case a traditional map, one can radically broaden and democratize the uses of statistical and numerical data. In some cases (see above), you end up with a cool gizmo, whose novelty rapidly wears off. In other cases, as in Zillow.com, it is more likely that the new tool will continue to be of real use.