WHERE TO REPORT FRAUD!

Department of Justice--- http://www.usdoj.gov/criminal/fraud/internet/

United States Government----http://www.usa.gov/Citizen/Topics/Internet_Fraud.shtml

FBI------http://www.ic3.gov/default.aspx

One way to help prevent scammers from scanning your ad is to change the @ sign in your email to an (at)
This does not give you a direct link from your ad to your email but any real buyer should figure it out.