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GIS data

Libre Map Project - Free Map Data for Everyone!

This is now my first stop when searching for basic boundary shapefiles (state, county, town), USGS raster data, and TIGER data (2003). I'm not sure who runs this site but the simplicity and open licensing are greatly appreciated!

URL: 
http://libremap.org/

Historical GIS data of Chicago

A couple of unique datasets from the Chicago, historical and present. Sprinkled with a couple good links to data clearinghouses.

URL: 
University of Chicago GIS

Harvard Geospatial Library

"A collection of 6,638 worldwide and regional geographic data layers, scanned historic maps and associated descriptive information that can be searched mapped and downloaded for use for use with your GIS software."

After you get past the ESRI restricted data, there is some fun stuff...

URL: 
Harvard Geospatial Library

Great Lakes Region GIS

Chock full of data for the Great Lakes region. Sorting by ISO 19115 Topic Categories.

 

URL: 
Maps and GIS of the Great Lake Region

GeoGratis

Canadian. Free. Literally.

"The collections include raster data, such as satellite images or scanned topographic maps, vector data, such as national-scale frameworks (grouped by theme), and a database of ground control points."

URL: 
GeoGratis