If you've been using PowerPoint 2007, you'll find a few small interface tweaks and a number of useful new features in PowerPoint 2010, especially for dealing with multimedia content. If you're upgrading from PowerPoint 2003 or earlier, you'll find an overhauled interface that radically changes how you interact with common features and functions.
Either way, we've got you covered. This cheat sheet shows newcomers how to get around; it also explores features that are brand new in PowerPoint 2010. We've noted which sections of the story former PowerPoint 2007 users can skip over.