(est. savings: $1.7 billion to $3.1 billion)
The U.S. Postal Service lost $8.5 billion in fiscal year 2010 and $2.2 billion in the first quarter of 2011. The Postal Regulatory Commission estimates that, by cutting back to five-day-a-week mail delivery, the USPS could ease its cash flow problems, saving $1.7 billion annually. The Postal Service itself puts that estimate higher, at $3.1 billion.