How do I delete a Facebook Friend?

[SmartA$$]

I want to remove someone from my friends list on facebook. I've tried several times to click on the X next to their name on the list of friends, but it doesn't work. Am I doing something wrong, or did I doom myself forever when I accepted a friend request from my Mother In Law?
Thanks Bruno, Done & Done. Best Answer coming your way as soon as Yahoo lets me.

[Miss Know a Little]

Go into Profile > Privacy Settings and block her. She won't know that you've blocked her. She just wont' be able to see your profile anymore.

If you want to be more discrete, you can select exactly what she can and can't see about your profile.

[Bruno]

You can click their name to go to their profile and then find the link that says, "Remove from friends." This will do the trick.

[Nicole]

Go to their profile and at the bottom left corner, theres a link that will take them off your friends list.

[ButterflyDreamGirl]

Friends----->All Friends----->(type in their name) Remove Friend....