1. Ponzi schemes
2. Senior investment fraud
3. Promissory notes
4. Unscrupulous stockbrokers.
5. Affinity fraud.
6. Unlicensed individuals, such as independent insurance agents, selling securities
7. "Prime bank" schemes.
8. Internet fraud
9. Mutual fund business practices
10. Variable annuities.

http://www.bankrate.com/brm/news/investing/20020829a.asp