Early versions of World of Warcraft were almost impossible to play.
So Sholes consulted a buddy who had studied up on letter-pair frequency, and he moved the keys that were most often typed together away from each other. After a few other minor tweaks, like moving up the R key, allegedly so that salesmen could impress buyers by typing the word "TYPEWRITER" using only the top row, we had our current QWERTY arrangement. Never mind that the most commonly used letters (E, T, A, O, I, N and S, respectively) were randomly scattered all over, and that it took forever every time you wanted to type "ESTONIA." Sholes wasn't trying to make the most ergonomically sound keyboard; in fact, QWERTY is deliberately engineered to slow you down so you don't have to worry about pesky typewriter jams.
And so you don't have to put "awesome typing skills" on your insurance claim.
Why We're Stuck With It:
The only reason we're still tying our fingers in knots more than a century later is simply because QWERTY got here first.
Since then, several more "scientifically" designed keyboard layouts have been introduced, including Dvorak, Colemak and XPeRT, which no one's ever heard of but which has an extra "E" on the keyboard.