Love it or hate it, the Ribbon is the main way you'll work with PowerPoint 2010. Instead of old-style menus and toolbars, the Ribbon groups small icons for common tasks together in tabs on a big ribbon. The Home tab, shown by default, contains the most commonly used features, including creating new slides, changing layouts and formatting text.
Other tabs have similar groupings. For example, the new Transitions tab shows buttons for items that you can use to create transitions between slides -- Cut, Fade, Wipe, Split and more. And in PowerPoint 2010, you can customize any Ribbon tab with whatever commands you like.
Back to the PowerPoint 2010 cheat sheet