"S. 3474 would amend the Federal Information Security Act of 2002 (FISMA) to improve information security throughout the federal government. CBO estimates that implementing the bill would cost $40 million in 2009 and about $570 million over the 2009-2013 period, assuming appropriation of the necessary amounts. Enacting the bill could also affect direct spending by agencies not funded through annual appropriations (such as the Tennessee Valley Authority or the U.S. Postal Service). CBO estimates, however, that any increase in spending by those agencies would not be significant or would be offset by corresponding increases in rates charged by those entities."
Congressional Budget Office: http://cbo.gov