Here are some links to institutions and useful sources of information.
Training and education institutions
Institute for Housing and Urban Development Studies, Rotterdam
I worked for many years at IHS and am still closely associated. They run an internationally oriented Masters programme on urban management, short courses and provide consultancy and research services.
Information links
Capacity Development
UNDP has a good site on capacity development: http://www.undp.org/content/undp/en/home/ourwork/capacitybuilding/overview.html
An old blog set up for the World Urban Forum in Vancouver, but still with some useful posts and links is:
http://urbancapacity.blogspot.nl/
Urban Planning
ISoCaRP
http://www.isocarp.org/
Royal Town Planning Institute
http://www.rtpi.org.uk/
Urban Information
European Urban Knowledge Network
http://www.eukn.org/