On Business Week site I also came upon a number of questions that one successful applicant recommends:
Questions to Ask
1. Quote a comment that you read about the school in an article like "X tries to increase the average GMAT". Ask the interviewer about how the school plans to increase the GMAT and what is the rationale behind it (make sure that you ask the question pertaining to that school, don't ask about X if you are not interviewing for X).
2. How strong is the alumni network of the school?
3. What are the events that alumni organize?
4. How strong is the alumni network in your country (if you are an international student)?
5. What kind of partnerships does the school have with other business schools?
6. How strong is the association of the school with the parent University?
7. Can you take courses at other schools in the university (like school of engineering, etc.)?
8. What is the ratio of tenured to visiting faculty?
9. Does the school have chaired professors and centers for advanced studies in topic of your interest?
10. Any tips on housing in the city and things to do outdoors in the area?