Among the things you think you should be able to do on Facebook but which aren't easy to find the link for: cancelling a friend request. Tech-Recipes shows us how, for those moments immediately following your second-guesses.
Head to the profile of the person you're requesting, then look for a "Cancel friend request" link in the left-side column, usually near the bottom. The link turns grey — but if your non-friend gets Facebook email updates, that might have already gone out. [Tech-Recipes]