Also check Psychology Resources/Indices
Anger
How Anger Affects the Brain and Body
What happens to our brains when we read
Drugs/alcohol
Mouse Party - great interactive site to see what happens to your brain on different drugs
Conspiracy Theories
Depression
This is your brain on exercise
The Flu
Happiness
Hate
Horror Movies
How does your brain respond to pain
Rewards
Your brain on sleep deprivation
What happens to the brain during sleep
Stress