Stefan Foulis asked:
> I'm new to ruby and rails. ...
> I followed "Agile Web Development with Rails"...
> How should organize the code?
> Multiple controllers: store_admin, project_admin, billing_admin, ... ?
> Or is there some other way I'm not aware of?
> ...

Look up "modules" in the book's index.

Austin's tip on better help than you'll find here is spot on, too - try the 
rails list he mentions, and also there's an IRC channel and a reasonably 
helpful wiki.

Cheers,
Dave