Just after my session on the management of XPe devices using Systen Center Configuration Manager 2007 I was asked to blog the settings You need to do to achieve this.
So here we go:
Edit the SMS_def.mof file that controls Your SCCM inventory collection and set the parameter information for OSProductSuite from FALSE to TRUE. This enables the collection of this parameter from the field devices. You need to wait some time until results arrive.
The create a new collection in the SCCM MMC using the selection criteria OSProductSuite = 64, which is contained in the Operating System object.
After this You should see your XPe devices (and only them) in that collection. If You need to distinguish between pre and past FP 2007 devices look for the string "Embedded" in the OSName property. Devices pre FP 2007 do not have this addition in the name.