I have updated my ADSI plugin for Windows PE, and also added x64 support.
Other new features are fully automated scripts for creating a Windows PE 3.0 image with the necessary components for ADSI to work.
Download link:
http://www.deployvista.com/Repository/tabid/71/EntryId/61/DMXModule/396/Download/attachment/language/en-US/Default.aspx
/ Johan