Loaded places from Open Guide to Boston into postgresql/postgis database. (approx 10000) Made Mapserver talk to postgis database. Made mapserver talk to web mapping server at http://sigma.openplans.org/ Put it all together and what do you get?

A map! http://boston.openguides.org/maps/boston-metro.png is a decent sized map, http://boston.openguides.org/maps/boston-metro-big.png is a 2000x1600 map, but that one looks cooler.

Now tell me that ain't an advertisement for Free Data waiting to happen...

(Thanks to the openplans folks for the WMS server! I'm loving it!)