What an awesome discussion of the two-spaces-after-a-period convention (gleaned from Anil’s daily links). If you look at my source, you’ll see that my grammar teachers sunk this rule deep into my literary psyche; try as anyone might, I’m unsure if there’ll ever be a way to dig it back out! Nonetheless, it’s a great look into how the convention may have come about, and a good example of how, in this day and age, its use is an issue of belief rather than correctness.