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Email is a social network, just like Facebook or LinkedIn. Outlook 2010's new Social Connector opens up your email network, showing emails you've exchanged with people, files you've shared and meetings you've had. It'll even bring in information from other social networks.
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.