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Here's a great video that shows one of the coolest new features in PowerPoint 2010 -- the ability to compare two presentations and merge them together:
You can even use PowerPoint 2010 presentation software to work on a presentation at the same time as other people in your organization, a practice known as co-authoring. We've got a great blog post about co-authoring here, or head over to Office.com for a step-by-step co-authoring article.
-- Erik Jensen