Spatial History Project at Stanford University

Fantastic example of a large-scale Historical GIS project at Stanford University. Interesting that HGIS is now becoming better known as Spatial History.
Spatial History Project

maptimeline

maptimeline -

Google Code

SIMILE Widgets

SIMILE Widgets

HGIS with Google Maps

Eastman's Online Genealogy Newsletter: Exhibit Transforms Your Spreadsheet into an Interactive Web Page

Mapping the harbor battlefield

Charleston Post and Courier article on mapping one of the most important Civil War battlefields in Charleston Harbour.

Reaching Back through Time | Articles & Archives | GeoPlace

City of Toronto - 70 Years of Air Photos
Reaching Back through Time | Articles & Archives | GeoPlace

Beyond Steel: An Archive of Lehigh Valley Industry and Culture

Historical GIS Project that includes a web mapping application and data download features. Interestingly has colour copies of Fire Insurance Plans (Sanborn).
Beyond Steel: An Archive of Lehigh Valley Industry and Culture - GIS - GIS
Comment: no where did I see a mention in the web pages where Lehigh Valley is. There references to Bethlehem and Bethlehem Steel but no specifics of where this is. Lehigh Valley is in Bethlehem, Pennsylvania. Even their web mapping feature has no mention of the geographic area one is viewing.

National Historical Geographic Information System

Welcome to NHGIS — National Historical Geographic Information System

Ontario Roots Genealogy Resources for Toronto Ontario (Upper Canada)

Ontario Roots Genealogy Resources for Toronto Ontario (Upper Canada)

Contains a number of maps and census information. Great for Historical GIS projects.