Potential questions

When did you discover Wikipedia? Did you begin to help edit and create articles right away, or later?
How many articles do you edit per (day, week, month...your pick.)?
Why do you enjoy contributing so much? What drives you?
What sorts of articles do you typically work on? Do they always corrolate with your personal interests?
What employment do you have? Do you work on Wikipedia while at your job? Do you wish that you were paid to work for Wikipedia?
Have you heard of Citizendium? If so, what are your thoughts on it?