The US Post Office. Good for two things: delivering my rental DVDs, and acting as the notification arm of the Internal Revenue Office.
A future project of ours is to look at all the tax-payer $$ added to all the USPS revenue to determine the actual cost of mailing a letter with the USPS. It isn't $0.44 as we are led to believe.
Shut it down. Sell the assets. If a letter is important, it'll get there.