Some samples of questions which you might want to find out from a potential employer:

• What are the company's goals? Future projections? Direction?
• What skills are important for this position? What experience is necessary?
• What opportunities are there for professional growth? Company growth?
• Why is this particular position available? Is this a new position?
• What are some frustrations of this position? Whom do you report to?
• Why did you join this company? Why did you pick this career/industry?
• What criteria do you use for performance evaluation?