In my day to day work with customers, I've noticed that many of them aren't aware that you can save an Office document as either PDF or XPS format directly from within the application. This feature has been around for ages, but you need to install a small free add-in to make it available.
The add-in allows you to export and save to the PDF and XPS formats in Office 2007 programs. It basically adds the extra formats to the "save as" dialog box. It also allows you to send an e-mail attachment in the PDF and XPS formats in a subset of these programs.
The products where this feature works are listed below:
You can download the add-in from http://www.microsoft.com/downloads/details.aspx?FamilyId=4D951911-3E7E-4AE6-B059-A2E79ED87041&displaylang=en.