As a second interview I get people to sit down and write code...I try to make the problem really technology independent.
My programming problems that I have don\'t reall
These aren't specifically OO Questions, but check out the other questions tagged interview-questions
Edit: What about implementing some design patterns? I don't have the best knowledge in the area but it seems as if you would be getting two questions for the price of one. You can test for both OO and Design pattens in the one question.