One of the best articles I have found, that mirrors the way Achieve Internet incorporates Environmental Psychology into the functionality and design of our website, can be found in the PsychNology Journal. David Benyon, does an excellent job of taking the historic roots of Navigation, Landmarks, Paths, and Urban Design, to reaffirm why these principles need to be applied into today's Web design.

http://www.psychnology.org/File/PNJ4(1)/PSYCHNOLOGY_JOURNAL_4_1_BENYON.pdf