LOL, you may think i'm crazy but i want to know how to moonwalk. So i searched the internet and found this:
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First, with you right foot slightly ahead of your left foot, right knee bent, weight on your right toes.
Drop the right heel when it passes the left foot, but keep on sliding until the right foot is comfortably behind you while still flat.
Here is a clip: http://www.popandlock.com/moonwalk.mov
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Now, that you know just keep practicing. I'm going to try it right now and i'll post later if i did it or not.
Good luck!