- Avoid any offer that promises you’ll make a lot of money for very little work.
- Don’t rely on a money-back guarantee. Con artists rarely give money back.
- Be wary of testimonials or endorsements.
- See if the Better Business Bureau has a Reliability Report on the company.
- Never give a credit card, debit card or checking account number to any person or company that promises employment. If they wantyou to pay them it’s a scam!
- Keep a positive attitude. You are likely to fail a few times before you learn the ropes.

A comprehensive list can be found here: http://excarsalesman.typepad.com/scams/