With all of the concern about Facebook privacy, you should also know how to remove a "Friend" should the need arise:
1) Login to Facebook
2) Click Account>Edit Friends (Upper Right part of page)
3) Click All Connections (Left part of page)
4) Click the "X" next to the person's name that you want to remove.
Facebook does not send a notice to this person that you have removed them from your Friend's List!