IF they are are the same as last year's essays...:
Essay 1 (required):
Personal Essay for the Medical School Application
Explain your motivation to seek a career in MEDICINE. Be sure to include the value of your experiences that prepare you to be a physician. (5000 characters max--notice that this is shorter than the AMCAS character limit)
Essay 2 (optional):
Optional Essay - Unique Experience
Briefly discuss any unique circumstances or life experiences that are relevant to your application which have not previously been presented. (2500 characters max)
Essay 3 (optional):
Optional Essay - Personal Characteristics
Please describe any personal characteristics and/or important or challenging experiences you have had that will contribute to the diversity (broadly defined) of or provide educational benefits to the student body. (2500 max characters)
Also, don't forget that characters include every letter, digit, punctuation mark, and space. Hitting "Enter" twice to make a new paragraph counts as one character.
I only did one of the optional essays (the personal characteristics one) because I didn't feel like I had any truly exceptional experiences that were not already adequately discussed in my personal statement and application. Judging from other SDNers on the school-specific pages, that's what a lot of people did. It worked out just fine for me (3 acceptance offers, 2 prematches and match to my #1).