Some interesting articels about archeological GIS from ESRI:
U.S. Bureau of Reclamation Administers Archaeological Sites with GIS
Modeling Archaeological Sensitivity in Vermont with GIS
Protecting Archaeological Resources During an Oil Spill in Washington State: Using GIS to Ensure Effective Communication and Protection
Prehistoric Sites on the Island of St. Kitts Studied Using GIS: Studying the Past to Understand Today’s Environment