McGraw Hill
Becoming a Psychologist
Detailed site listing not only the recommendations for becoming a psychologist but also all of the American Psychological Association recognized fields of specialization. Includes descriptions of each field, contact, journals, etc.
Other
Child Development: Stages of Intellectual Development
Provides details of Piaget's theory of intellectual development, used by many developmental psychologists. It contains a chart illustrating "Stages of Cognitive Development."