Did you ever upgrade to Ermine, Taz? I forget. If you didn't, hibernation works better in Ermine. If you did I don't have a good answer for you (sorry!
Bad answer: Hold the rotate button down until the "eDGe options" menu pops up and tap "Hibernate". But I seem to remember there are problems with this approach. Someone help me here -- is it okay to enter hibernation from the rotate button menu on an Erminized PE??