What are the financial reporting scandals of the past decade?

What are the financial reporting scandals of the past decade?  What are the resulting U.S. legislative attempts to impose ethical behavior and control the incidence of new reporting problems via the Sarbanes- Oxley legislation? What is the potential impact of the Ethics related provisions of the Sarbanes-Oxley Act on the likelihood of similar future frauds and accompanying prognosis for future corporate ethical behavior?