I would love to be corrected if this is wrong, but I believe if you want to install XP in the way you want you have to use RIS or WDS in mixed or legacy mode, which is the same as RIS. it sounds like server 2008 will not support these WDS modes so it looks like companies deploying XP using risetup vs riprep for the foreseeable future will have a 2k3 server for the foreseeable future. again I would love to be corrected if there is a way for regular WDS to set up a cd based install of XP.