Wikimedia
Wikipedia: Psychological Testing
Provides detailed information on psychological testing, describing its history and the many types of tests.
Wikimedia
Wikipedia: Personality Psychology
This article on the psychology of personality gives information on the two traditional models, discusses the "N" and "S" personality types, and briefly mentions criticisms leveled at the two models.
Other
Businessballs: Self Awareness Training
The following resource is a course on self-awareness. It offers a variety of links to information dealing with how to be self-aware.