Skeptics

Bad Science

• Bad Astronomy
• Insultingly Stupid Movie Physics
• The Rejection of Pascal's Wager

Religion

• Dealing With Mortality
• Landover Baptist
• The Closet Atheist
• Mr. Deity

General

• Gesellschaft zur wissenschaftlichen Untersuchung von Parawissenschaften e.V.
• Committee for the Scientific Investigation of Claims of the Paranormal
• James Randi Educational Foundation

Medicine

• Quack Watch
• The National Council Against Health Fraud