Linking GPOs in a Script

Linking existing GPO to an OU is just a matter of putting value in gPLink attribute on OU object. You can do this with any tool which will allow You to set attribute - just see how this attribute is filled with values (in case many GPOs are assigned to single OU). Here is VBscript example:

http://www.activexperts.com/activmonitor/windowsmanagement/adminscripts/usersgroups/ous/#AssignNewGPOLink.htm

You can also use GPMC interface, here is example:

http://www.leadfollowmove.com/archives/powershell/linking-a-gpo-using-gpmc-and-powershell

These are also POwershell cmdlets from Darren - You might want to take a look at it:

http://www.sdmsoftware.com/freeware.php

With R2 You will get GPO Powershell cmdlets:

http://technet.microsoft.com/en-us/library/dd367856%28WS.10%29.aspx

Planty of options ...