Why not somehow integrate the 3.0 Menu system into the same screen as when you click on Pages? I think it’d be easier to drag them around rather than entering numbers in for page order…I think being able to order them by typing in a number would make things confusing. I don’t know…maybe I’m wrong. Just throwing this out there!
Worse, every time you rearrange your pages with the “menu order” or “parent” on the page, you will have to manually synchronize that with your “navigation menus,” and vice versa — total FAIL, WordPress team.