Here we are - Group Policy Preference Client Side Extensions are now available for download. This is a cool thing bringing lot's of Group Policy Power to admins around the world!

The GPP CSEs are included in Windows Server 2008 RTM, but can now be downloaded for:
Windows XP SP2+ (32/64 bit)
Windows Server 2003 SP1+ (32/64 bit)
Windows Vista RTM+ (32/64 bit)

These are the links:
GPP CSEs for Windows Vista (KB943729)
GPP CSEs for Windows Vista x64 Edition (KB943729)
GPP CSEs for Windows Server 2003 (KB943729)
GPP CSEs for Windows Server 2003 x64 Edition (KB943729)
GPP CSEs for Windows XP (KB943729)
GPP CSEs for Windows XP x64 Edition (KB943729)

To get Group Policy Preferences on your network all you need is a single Windows Server 2008 as a management station in you existing Windows Server 2003 AD (or 2008 AD of course). When RSAT (Remote Server Administration Tools) is out there - very soon! - a Windows Vista SP1 will be enough to get this cool functionality in your domain!

But remember, no GP Preferences (GPP) without the CSEs - so go ahead and download them now ;-)

Source: Jakob H. Heidelberg