Navizon provides a free peer-to-peer wireless positioning software. To be used on mobile devices, phones and — iPhone. It runs on all OS, so you can also install it on your laptop and see where you are. To use it you need to register for free. Then Download it here.
A gem from Harvard’s Library Open Collections Program: Their section on Immigration to the United States links to the Hull-House Maps and Papers, A Presentation of Nationalities and Wages in a Congested District of Chicago, New York: T.Y. Crowell, c1895. The ebook includes high resolution, colored images of the maps on wages and nationalities. Here is some background on Florence KelleyThe Slums of the Great Cities Survey Maps, 1893 and the origin of that publication.
This is a link to an example from the New York Times that tries to tell a spatial story. You can hover over the neighborhoods to see what stories relate there. In addition, and that’s even more interesting, you can hover over the squares at the bottom, for example “neighborhood makeup”.