Revit 2008 does not allow you to rotate the door window tags other than 90 degrees. However, if you edit the tag family (in the Family Editor), there is a parameter in the Settings menu > Family category and Parameters dialog box that allows you to rotate with component.
Some architectural offices might want to rotate the tag 90 degrees from that of the door (to align with the door panel). In this case, one could rotate the tag in the family editor by 90 degrees. If it is combined with "rotate with component" option, that will save some time.