1) Fake Lottery Scam
2) Phishing-Vishing Scams
3) Phony Job Scam
4) Negative Option Scams
5) Nigerian 419 Scams
6) Pump and Dump Scam
7) Bogus Fuel Saving Devices
8) Grandparents Scam
9) Oprah Ticket Scam
10) craigslist Scam

http://www.consumeraffairs.com/news04/2006/12/top_ten_scams.html