Internet Crime Complaint Center: A partnership between the Federal Bureau of Investigation (FBI) and the National White Collar Crime Center (NW3C). Alerts for consumers and easy-to-use reporting mechanism for fraud. Formerly the Internet Fraud Complaint Center

MLM Watch: Exposes pyramid schemes get-rich hype and dubious product claims. Authored by Stephen Barrett, M.D. of Quackwatch

Skeptic's Dictionary: Pyramid Schemes, Chain Letters and Ponzi Schemes: Defines these fraudulent systems of making money which require an endless stream of recruits for success