You will thank your third-grade teacher.

Wonderful article in the NY Times on a great opportunity provided through eBay: buying items that are misspelled and reselling them for a profit. A correctly spelled item will attract substantially more potential buyers, and thus is more likely to sell for its fair market value - one guy was mentioned who bought a box of "gers" for pocket watches for $2, and he sold them (as "gears") for $200.