Django Admin app or roll my own?
I'd go with the Django admin functionality, over writing your own.  You can customize the Django admin by adding your own templates for the admin, your own widgets, etc.  I'm working on a project with a very customized Django admin.  If we had decided to write it by hand, it would have taken 4 times as long to get done.  I just can't see a scenario where you would want to write your own.
I'm just starting to use Django for a personal project.
What are the pros and cons of using the built-in Admin application versus integrating my administrative functions into the app itself (by checking request.user.is_staff)?
This is a community wiki because it could be considered a poll.