I'm curious - as a long-time Ubuntu user who is totally resisting any effort to switch to Unity - how does one 'learn' the menu functions available for a new app with the HUD? I don't know anything about it, but is it possible still to see all the menus/submenus with the HUD somehow, or does one have to poke with the app to see the menus? As a naive outsider looking at Unity, I'm not sure I find the appeal of the HUD to be applicable .. maybe as an experienced user you could bridge this gap for me?