What are the best uses for the Django Admin app?
Let's say you create a model called Entry. IE an extremely simple blog. You write a view to show all the entries on the front page. Now how do you put those entries on the webpage? How do you edit them?
Enter the admin. You register your model with the admin, create a superuser and log in to your running webapp. It's there, with a fully functional interface for creating the entries.
On the website, it says this: 

One of the most powerful parts of
  Django is the automatic admin
  interface. It reads metadata in your
  model to provide a powerful and
  production-ready interface that
  content producers can immediately use
  to start adding content to the site.
  In this document, we discuss how to
  activate, use and customize Django’s
  admin interface.admin interface.

So what? I still don't understand what the Admin interface is used for.  Is it like a PHPMYADMIN? Why would I ever need this?