General urban and land cover modeling

ESC
The Environmental Simulation Center
Developing and applying new approaches and technologies to Urban, Regional and Community Planning.

GIS-EM4
GIS and environmental modeling conference held in Banff, Canada, August 2000.

CASA
Currently under the leadership of Michael Batty and Paul Longley the Centre for Advanced Spatial Analysis is producing fine work on urban models, among other things. This link goes directly to their working papers section. Look particularly for publications by Paul M. Torrens.