Chicago Architecture Foundation [ http://www.architecture.org ]
The Chicago Architecture Foundation is dedicated to advancing public interest and education in architecture and related design

The Royal Institute of British Architects [ http://www.riba.org ]
One of the most influential architectural institutions in the world, has been promoting architecture and architects since 1837.

Skyscrapper Guide [ http://www.allaboutskyscrapers.com/ ]
All About Skyscrapers is a comprehensive guide to everything related to skyscrapers.