Chris Pratley posts on his blog about how OneNote 2007 is Ultra Mobile PC “ready” as he talks about the “minimal UI mode”
OneNote 2007 has a new mode we currently call “minimal UI mode” (insert sexy name here). It’s designed to cut out distractions for when you really just want to take notes. Those of you with tablet PCs also know that the more screen space that can be devoted to ink the better since you tend to write much larger than you type. OneNote 2003 also has a minimal UI mode, but it is only available when the OneNote window is very narrow (<300px or so) because it was designed for quickly jotting a one to two-line note or dragging something into it from the web. In OneNote 2007 this mode is available at all window sizes, even full screen. It hides the navigation UI (page, section and notebook tabs), as well as any extraneous toolbars or task panes and leaves you with just the set of commands you need to take notes on a page.