SCCM: Get Drivers From Driver Packages (WQL)

I was searching for a way to list Driver Packages which contain Drivers. Why? I want to use Driver Packages without importing the drivers in SCCM.
Why? You can read about that here: http://hayesjupe.wordpress.com/sccm-osd-driver-best-practices/

I found an interesting script of Christjan which can detect differences in drivers between Driver Packages. The script contained the necessary WQL statements that I needed.

Here's the link to his script:
http://pr3m.pri.ee/blog/?p=653

Example WQL query for displaying the PackageID and Name of Driver Packages that contain drivers:

SELECT DPKG.Name,DPKG.PackageID FROM SMS_PackageToContent AS PTC

JOIN SMS_CIToContent AS CITC ON PTC.ContentUniqueID=CITC.ContentUniqueID

JOIN SMS_Driver AS DRV ON CITC.CI_ID=DRV.CI_ID

JOIN SMS_DriverPackage AS DPKG ON PTC.PackageID = DPKG.PackageID