Your work experience, GMAT score and GPA is good, and your extracurricular and volunteer activities are impressive. I would also suggest that you begin reflecting on volunteering and sports activities for leadership stories for your essays.( MIT, Booth).
Look at 2011-12 essay questions of your target schools , research their websites to see what they are looking for in candidates.
You have stated that you have cross site and multicultural teams, so you may want to focus on your experiences/ stories that showcase your cultural adaptability and team working skills. Also, focus on your potential that led to your early promotion. It is my understanding that if you begin working on your stories from now , you will make your essay writing job for four schools easy and effective.
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