By this time many companies use SharePoint as their central document repository. To simplify and accelerate the access, it would be comfortable to add a link to the Office “My Places” bar. The My Places bar appears in the left pane of both the Open and the Save As dialog boxes in Microsoft Office programs.
To add an item create the following registry key:
Windows Registry Editor Version 5.00
You can also hide items you don’t need. Read more on the MS Knowledgebase: How to customize the My Places bar in both the Open and the Save As dialog boxes in Office
To deploy the key to all clients in the domain you can use group policies.