I would try a couple things...
1. Call the admissions office and ask. Some schools will put you in touch with some student reps...others won't. 2. For those that won't I would check out the threads on this site and others to find current students that are helping out. I know that in the Haas thread here is a guy who is a current student helping out and answering questions.
3. Check out facebook. Every school that I am applying to has a facebook page and students on there that I am sure you can contact.
4. What I did with all my schools was to go to the club websites that I was interested in and email them. There should be an email addy that will go to all the officers in the club.
5. Something else I did was to ask each student I spoke with if they knew someone else that was either like me (i.e. similair background) or had similair career aspirations and asked them if they could pass on my email address. This way I was able to speak with numerous students from each program.
Good Luck!