Last month, I posted on 2008's eight worst ideas. At the top of my list was deregulation. Robert Rubin, who spent a decade as a director of Citigroup (NYSE: C) and is now retiring, is partly responsible for one very important act of deregulation -- the repeal of Glass-Steagall which separated investment and commercial banking. (It was former Citi CEO Sandy Weill's 1998 merger of his Travelers with Citi that spurred Glass-Steagall's repeal in the 1999 passage of the Gramm-Leach-Bliley Act which allowed commercial and investment banks to own each other.)

And by bringing down that barrier -- established in the wake of the stock market manipulations of the 1920s enabled by commercial banks that made margin loans to trade stocks -- the U.S. helped usher in the current financial catastrophe. Now the government is gradually reimposing Glass-Steagall -- in effect, if not in law.

Rubin was well rewarded for his decade of "service" to Citi -- taking in $126 million and being paid as an employee while claiming to be a mere advisor. But for that measly sum, Rubin's reputation -- which was at its zenith following his tenure as Treasury Secretary in the 1990s -- is shredded. It probably didn't help that since he joined Citi's board in October 1999, its stock has fallen 82% -- destroying $164 billion in stock market value. Meanwhile, the empire that Weill ushered in -- based on the idea that people wanted to buy all their financial services from one provider -- is being dismantled.