Pattern Language

http://www.patternlanguage.com/

Christopher Alexander
http://sv.wikipedia.org/wiki/Christopher_Alexander

Nikos A. Salingaros
http://zeta.math.utsa.edu/~yxk833/

http://sv.wikipedia.org/wiki/Designm%C3%B6nster

Web Design Lessons

http://www.webdesignlessons.com/