Unlike a pre-tax healthcare flexible spending account, where you forfeit any unused balance at the end of the year under the use-it-or-lose-it rule, you can roll over any unused balance with an HSA, building a tax-free healthcare retirement kitty.

FORBES: What If You Use Your Health Savings Debit Card For Take-Out?

An accounting change last year raised the liability of unused frequent-flier miles on company balance sheets and gave airlines more incentive to get miles off their books.

WSJ: Saving Frequent-Flier Miles From the Ax

The unused input can be sealed with the patent pending V-CORK to accurately balance the sound and prevent corrosion.

ENGADGET: V-Moda ships its listener-influenced Crossfade M-100 headphones