The Center for Excellence in Education's Research Science Institute
I'm preparing this now in preparation for next year, when I'll rise to the top of google searches once again and a hoard of terrified juniors prepare to through themselves off the cliffs of chance.
I've written up a couple of posts of advice on essays, located here and here. No, I will not read and edit your essay--I get too many requests to fill them all and it would be unfair for me to be selective.
Now, as far as my RSI experience goes, it's recounted in the July archive from 2010 as well as the last few posts from June of that year. It should be noted that these posts were written throughout Autumn, well after the events occurred, and cannot therefore be assumed factually accurate.