Naming conventions for controllers

[eluser]ilSignorCarlo[/eluser]
Hi,
everytime I start a new project with CodeIgniter I'm not sure about a good practice in organizing the whole project.

For example, how do you usually choose the name for a controller? Is it a good habit to name controllers after the site structure? For example: a "home" controller, a "user_profile", "admin" and so on. Almost a controller for every main page of the site.

This usually tends to work (at least, for me), but I suppose it is a wrong approach.

Can you show me some examples of controller names or of a directory site structure?

Thanks,
Carlo