So as I'm learning how to use this goofy site that everyone seems so attached to, I'm also learning some of the neat tricks you can use to protect yourself. Today's victory was the "See how a friend sees your profile".
Not surprisingly, as time goes on, Facebook changes this and makes it harder to find. I don't have time for a full update at this time, but as of Feb 2012, go to Account Settings and click the link on the left for "Your profile" (it's small and hard to see, but it's there). Then on the upper right side of the screen you'll see the Veiw as option.
The old way
If you go to Account > Privacy Settings > Customize Settings , you'll see a list of all your privacy settings and who can see what on your page. But up at the very top, you see a buttons labeled "Preview my Profile". Click that and you'll see what your profile looks like. At the top, enter the name of one of your friends to see your page as if you were them.
This is very helpful if you want to be selective about who sees what particularly if you take my recommendation to group your friends. You might want to be sure that your can't see what your real friends can see.