American Planning Association
http://www.planning.org/

Centre of Advanced Spatial Analysis, University College of London
http://www.casa.ucl.ac.uk/

City-Data.com
http://www.city-data.com/

Santa Fe Institute
http://www.santafe.edu/

The Urban Institute
http://www.urban.org/index.cfm

Blogs:
The Chaotic, Fractal and Complex City
http://mcadamsfatih1.blogspot.com/

The Urban Flâneur Guidebook
http://urbanflaneruguidebook.blogspot.com/

This will be updated as directed by the Editorial Board

Patterns of Democracy
Arend Lijphart

•  DATA USED IN CHAPTERS 15 AND 16 OF PATTERNS OF DEMOCRACY
• TWO DIMENSIONS AND TEN BASIC VARIABLES, 1945-1996 AND 1971-1996
• DETAILED DATA USED IN PATTERNS OF DEMOCRACY