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PowerPoint 2010 solves the old problem of adding videos to presentations. You can simply drag and drop in a video, and even edit it and add special effects without leaving PowerPoint.
Based on the old favourite, Groove, SharePoint Workspace 2010 takes SharePoint libraries offline, giving you a local copy and tools for synchronising content back and forth.
If you're using the Office Web Apps to host collaborative editing in Word, you'll get the opportunity to merge changes every time you save your file.