I have been reading about Jonathan Edwards off and on for the last few years.  From his part in the Great Awakening to his extensive writings, he is well worth learning more about.  Here are some brief thoughts on four biographies:

Jonathan Edwards 
by George Marsden

At over 600 pages, this is the definitive biography. 
If you want to learn a lot about Edwards’ life and thought,
this is the place to go.  Scholarly, yet very accessible.

A Short Life of Jonathan Edwards
by George Marsden

As the title suggests this is a shorter biography
(about 150 pages) by the same author for the
person who wants a quicker summation of Edwards’ life.

Jonathan Edwards: A New Biography
by Iain H. Murray

At around 500 pages, this biography gives a full and clear
look at Edwards’ life and thought.  Spiritually challenging.
This was the first bio of Edwards I read.

Jonathan Edwards and the Ministry of the Word
by Douglas A. Sweeney

At around 200 pages, this is a good introduction to Edwards’ life and thought.  Well written and easy to read.  As the last bio of Edwards I read, I found it to be a good summary and reminder of Edwards’ life.