I still have a Windows Server 2003 domain. We'll be moving this to Server 2008 R2 in February. I know in 2006, Microsoft bought DesktopStandard and moved their PolicyMaker product into what's now known as the Group Policy Preferences. Is there anyway to still get PolicyMaker for Server 2003?
Are you asking if you can install the actual PolicyMaker product, or do you just want the functionality?
If you just want the functionality, its worth noting that you don't actually have to upgrade your DCs to Server 2008/R2 in order to use Group Policy Preference extensions.
To add preference items to your GPOs, you must edit the GPO from a computer running Vista/2008 or higher.
To have the client computers understand and process preference items, you need to install the Group Policy Preference client-side extensions (CSEs) on your XP/2003 computers. This is easiest via WSUS, or even a computer startup script if you don't have WSUS in place.