The C.G. Jung Institute has good resource links to the theortical personality model and psychiatric analytical approach of the late Swiss theorist Carl Jung. A good first stop to find resources on this subject.

The Psychology Wiki aims to provide an up-to-date, authoritative statement of knowledge, theory, and practice in the whole field of psychology

Home of the professional association for psychologists includes news and information.

Wikibooks is a special collection of text books from the people at Wikipedia. This one is titled, "Psychological Testing."