How do you handle administration functions/interface?

[eluser]jleequeen[/eluser]
@Jemgames

Do you use URI Routing to make URL's shorter?

@Dam1an

Do you have separate models for your admin/public functions?

@Anyone

My application basically has 3 types of user. I have a public user that can see the site and doesn't have a login. The other two types of users need a login. One is someone who registers for the site, and the other is a administrative user who manages the site. I'm basically trying to decide which way to go. Either create basically three separate apps, although I like the idea of organizing my controllers into sub-directories for each type of user...but then I also have some controllers/views that need to be shared between the registered user and administrative user. It seems that duplicating the controllers for each type of user would be redundant in that scenario.