paperbag - that's not jacking the thread - it's a very good question and would also love to hear what others have to say (always good to know this sort of thing in advance). So far I have experienced a range of technical questions (more related to Air Law than the specific aircraft) right through to the organisation/chief pilot just wanting to get to know me as a person (which is obviously important given that people skills are important when doing scenic and charter flights!)
I have also been asked a few scenario type questions. Not ones where I go away and work it out with a pen and paper, but more to see me think on my feet a little (I assume).
Have also been asked about my motivations for wanting to fly, end goals, and thoughts of living in various places while I work for the place.