I.R.S. Moves to Close Tax Shelter Shortly After I.B.M. Uses It to Save $1.6 Billion - New York Times

More on the IBM tax evasion scheme (no subscription required for this one) 

For the second time in 12 months, the government has moved to block a tax shelter that had been aimed at converting billions of dollars of corporate profits, on which taxes have yet to be paid, into profits that will never be taxed.

I.R.S. Moves to Close Tax Shelter Shortly After I.B.M. Uses It to Save $1.6 Billion - New York Times