Harvard published essay questions and deadlines for its 2012 MBA program:

Essays (MBA applicants only):
All application questions below are required.
* Tell us about three of your accomplishments. (600 words)
* Tell us three setbacks you have faced. (600 words)
* Why do you want an MBA? (400 words)
* Answer a question you wish we’d asked. (400 words)

Round 1- October 3, 2011
Round 2- January 10, 2012
Round 3- April 10, 2012

Put Me in Business (applying in less than a year)
Put Me in Business (applying in more than a year)

MBA essay examples