I'm not sure I really want to know that kind of information... Anyway, there was a survey thread in here some years back... that one more serious than what you're suggesting, but it still presents the same problem as yours, I think - while it is fun to fill out, it's not something that will make people come back. You fill that questionaire once, and then you're done with it and move on. What's needed here -as you said- is interaction. I'm afraid you won't get that with a survey. ...doesn't mean it wouldn't be fun to do.