I’d almost missed noticing this really cool integration feature between Sharepoint and Outlook.
You can now Open, edit, and update files from a SharePoint site inside of outlook. This is
For example, you might be responding to e-mail and then need to refer to some team guidelines on your SharePoint site. If you have connected your SharePoint library to Outlook, you can browse for and view the file just as you would an e-mail message, without leaving Outlook. This feature enables you to view your files offline without opening your web browser or rather stepping out of Outlook.
The only issue I have with this is that each Shared Document library is synchronized completely. Would have loved to see a feature where one could choose which Sub-Folders in a library one wanted to keep synch. Hopefully in the future this should be available.
Besides files you can also integrate a Sharepoint Task list with your outlook task list. If Collaboration is the future I feel Microsoft is king in their support for it.