Just to let you know.
After the upgrade to SP1a I was not able to image our laptops. This due to ZENworks Imaging not able to detect the disk... well that's the short version ;-)
After some searching I decided to try to put the ZENworks Imaging Driver Update for September 2011 on. That did the trick.

Don't know why this happend, it worked with the old version of the drivers. Anyone knows which version ships with SP1a?