I have to say that while it may be helpful in YOUR mind to get a head start, I think it can also backfire. I have seen paralegal after paralegal fail miserably in law school because they came in with preconcieved notions about "LAW". Being a paralegal is not being a lawyer without the JD. But they think because they know some terminilogy or can draft the right number of copies of a complaint, they are ahead of the game when in fact, all that stuff hinders them and makes them unable to let go of their past thoughts and learn what the professor is trying to teach them.
I think to some extent trying to read ahead in the summer is going to be counter productive in that same sense. Maybe not to the degree, but to a point. You are going to read this E and E (which I admit are the best thing since peanut butter and chocolate ice cream) but without any context, without any background, without purpose. Hell, they are sometimes difficult to understand when you are reading them in conjunction with your casebooks and classes. Without a frame of reference, or background that the professor gives you in class, how knowing what "promisorry estoppel" is in a vacume won't help you in the end and I think it will do more to confuse you, rather than help you. Because you will have read this great chapter on it and think you have an inkling of what it means, but without th eperspective of the classroom teaching and the casebooks, you will actually be pretty misguided, I think.
I see nothing wrong with wanting to familiarize yourself with the jargon and terminology and concepts prior to going, but once you walk in that door on the first day of 1L, EVERYONE is on the same bottom rung. It doesn't matter what you did in a previous life, or if you cured cancer, or worked as the paralegal for the top law firm in the country. The day you start law school, you are all equally as stupid.