When Microsoft revealed the next version of Office, one of the most talked about upgrades was the "ribbon" menu system. I personally liked the ribbon interface, but Microsoft was hit with many complaints about it.
In the next technical refresh of Office 2007 the ribbon menus will be set to automatically minimize when not in use. This is very similar to auto-hiding your taskbar in Windows. There will also be other menu improvements in the next beta scheduled to be released to testers soon.