Chain Letters
Description of chain letters, why people think they can work, why they can't work. Extensive links.
Chain Letters Are Not Legal
Postal Service judicial decision that debunks the claim that sending a "report" in exchange for cash makes a chain letter legal.
How Chain Letters Really Work
Describes how chain letter participants rarely, if ever, profit from them: Chain letters are carefully crafted business letters asking for contributions.
Pyramid Scams
Site describes how pyramid scams operate, how to identify them and avoid becoming a victim.
US Postal Service: Chain Letters
Describes illegality of chain letters.