A: 

Generally your main view controller should get the notification so you can take action in there to get your other view controllers to do appropriate actions, under way would be to register for device rotation notifications with the popover and handle it like that.

Daniel
AH! I hadn't thought of going the route of explicitly registering for device rotations inside the popover. I like this approach. As for using the mainViewController to take action, that should work for many folks, but in my case this menu popover will happen in a great number of detailViewControllers at various stages of the application, so I moved it out to the appDelegate for safe-keeping.
Greg Combs
A: 
Greg Combs