Psychology Links for 
Thinking

Intelligence

Traditional and Alternative IQ tests Online 
Queendom IQ tests online  
Self-Growth.com IQ tests online 
School Psychology Resources on Mental Retardation (and related topics)

Problem Solving & Creativity

Mind Tools 

Genetics, Brain, Thought and Language

Pinker vs Rose Debate (This 1999 debate was one of the best attended in the 20th century)

Consciousness

States of Consciousness  (hypnosis, out-of-body, dreams, and lucid dreams)
Consciousness Research Laboratory

Models of thinking

John Anderson's ACT model (this is a very sophisticated model)