$58 Billion Unclaimed: Is Some Of It Yours?

That $58 billion is more than just money from bank accounts that have been escheated (turned over to the state) due to lack of activity. 

From CNN Money:

Currently, states, federal agencies and other organizations collectively hold more than $58 billion in unclaimed cash and benefits. That's roughly $186 for every U.S. resident. The unclaimed property comes from a variety of sources, including abandoned bank accounts and stock holdings, unclaimed life insurance payouts and forgotten pension benefits.

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The article includes links to sites which can help you search for undeliverable tax refunds, life insurance, pensions, missing savings bonds, and overbid proceeds.