Here are the references for the most up-to-date information on the subjects indicated:
THE PERSONALITY PROJECT
A cooperative effort to centralize information sources for those interested in the study of personality – both inside and outside of academia
BIG FIVE PERSONALITY TRAITS – Wikipedia
Concise, but accurate, explanation of the five value-weighted traits psychology uses for personality assessment today
PERSONALITY PATHWAYS – Using Myers-Briggs Personality Type
An informational source for the various applications of the MBTI® and the psychological type framework of Carl Jung to various group settings
GENES AND BEHAVIOR – Interview with Professor Gary Marcus on the Relationship Between Genes & Behavior
Information on the roles of genetics and environment on personality development
SCIENTISTS UNCOVER NEW CLUES ABOUT BRAIN FUNCTION IN HUMAN BEHAVIOR
National Institute of Mental Health press release/article on the discovery of a genetically-controlled brain mechanism responsible for social behavior in humans