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I just got done with my custom registration system that I got here, the awesome tutorial.

I have an idea that is more of an extension to that tutorial. As you see in this forum, once a person signs in, at the top you see
Last visit was: Fri Jul 06, 2012 9:42 am

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Somebody could create an awesome tutorial that teaches how to show or hide certain divs, if a person is logged in or not.
For example: Logged Out / Guest
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Garret27
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if(isset($_SESSION['user_id'])){
 user is logged in. Show div.
}else{
user is not logged in. do not show div.
}

is this what you mean?
This same thing could probably be done with some basic Javascript too. Unfortunately though, I know about as much Javascript as I know astrophysics, so I can't help you there.