As I mentioned earlier in my post, BeatTheGMAT began its webinars on breaking the essays. I attended both the webinars of Harvard Business School and Stanford Graduate School of Business. Though I have taken notes for each of them, I feel they are kind of same from the video links. Hence, I am posting the video links directly rather than giving the gist.
Harvard Business School: http://www.beatthegmat.com/mba/harvard-business-school-essays
Stanford Business School: http://www.beatthegmat.com/mba/stanford-business-school-essays
Personally, I had to re-work on some of my essays after these webinars. Some of the tips are very useful and the presenters, including David Park, have done an amazing introspection into the essays.