Even if an e-mail message doesn't require a direct response, the information in the message may still cause you to:
- Store contact information
- Create a task
- Set up a meeting
You can get started with each action by simply dragging the message to the appropriate button on the Navigation Pane. While this functionality isn't new to Outlook 2007, it's a handy way to see how messages in Outlook can have uses beyond e-mail.
Note that dragging creates a new item, and doesn't get the message out of your Inbox. It's up to you to delete it if you don't need it anymore.