Even in its corporate logo - known as "the crooked E" - there was always a brazen quality to Enron, the energy giant that collapsed in the most complex and consequential of recent US corporate frauds. But on Monday Jeff Skilling, the brazen mastermind of Enron's rise and fall, was finally given a lengthy prison sentence.

This may bring a form of psychological closure to the many victims of the Enron collapse, some of whom were allowed to voice their grievances to Mr Skilling's face before his sentencing. But there are still civil suits outstanding against some of the banks involved with Enron, and though the US has since passed the Sarbanes-Oxley legislation to curb accounting fraud, there can be no room for complacency that the general gullibility about Enron will not be repeated elsewhere.