Controller layout of private messaging

Hey am after some advice on how to layout my controllers and models
for inbox/sentbox private messaging functionality.

i have it all working at the moment but i believe it to be quite
messy. i have this so far.

controllers/actions:
mbox/notification_controller.rb
  - list
  - destroy
mbox/privmsg_controller.rb
  - inbox
  - sentbox
  - destroy
mbox/user_comments_controller.rb
  - list
  - destroy
privmsg_controller.rb
  - new
  - show
  - reply

can someone give me some advice on a good way to layout my
controller's actions, to simulate a linked-in sorta messaging system?