<pedantic clarification> For those who first encounter the word "typo" indirectly as TamDenholm did, it's worth noting that a typo is not just any spelling mis

<pedantic clarification> For those who first encounter the word "typo" indirectly as TamDenholm did, it's worth noting that a typo is not just any spelling mistake; it is a mis-spelling rendered in a type-set text and arising not through the author's ignorance of spelling but rather through a mis-operation of the typing apparatus (often arising through hasty typing). For elaboration, see http://en.wikipedia.org/wiki/Typographical_error http://en.wikipedia.org/wiki/Typographical_error. If one believed (erroneously) that "spelling" were correctly rendered "speling", that would not be a typo but a spelling mistake. On the other hand, if one rendered it "speling" because of a finger slip on the second press of the "l" key then it would be a typo. </pedantic clarification>