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PowerPoint 2010's new transitions take the load off your CPU, using the GPU instead. The resulting effects are smooth, complex and give PowerPoint presentations a whole new lease of life — or at least give them a chance of attracting someone's attention.
If you've been using the Excel Web App Technical Preview, you won't be surprised by the version bundled with SharePoint 2010. There's very little difference — apart from the SharePoint wrapper around the service.
Office 2010's Protected View is a sandbox that helps reduce the risk of malware propagating through emailed and web documents. It's not just for the new Office formats, either — common formats like RTF are handled the same way.