Watch Rob Barker from the OBA team talk about how Microsoft Office and VSTO can bring together the richness of the Office client and the reach of the web.
Here is the official abstract:Come learn how to make your Web service instantly recognizable to over 400 million people worldwide. Hear how Microsoft Office has evolved to provide for developers to extend the world's most widely used productivity suite with services from the Web.
Here is an example of adding maps to your Outlook email.
Also you can mash up your Flickr images based on the mail message.