This was for a uni project in which we had to design a new menu system for the PSP, along with a PSP skin and carrying case.
I didn't get very far with make sub-menus or anything, but the basic idea is there. To be honest I was much more focused on creating characters than designing a menu.
To operate it press the left and right shoulder buttons to rotate the wheel, then click on the wedge displayed at the bottom to view it. Click again to revert back to the wheel (or alternatively press the shoulder buttons to view the next wedge straight away). The only menu with any type of sub-menu is Photos, in which the top 3 buttons are clickable. Other than that, the menu has no function (other than to look pretty ;P ). This was made in the early days of my learning Flash.. it could be improved a lot, but since the project is long over I don't see the point.
Here are links to my skin and carrying case designs (they're much cooler!):