Introduction to Contributor Settings

One of the misconceptions concerning SharePoint Designer 2007 is that uses have free reign to all of the features of the product.  You can adjust what end users can do in SharePoint Designer to help protect the health of your production environment.

Here's a link to the Microsoft SharePoint Designer help and how-to section that explains how to take advantage of these capabilities.

http://office.microsoft.com/en-us/sharepointdesigner/HA101174691033.aspx

-- Ben