i just finished reading a book by dr. bruce ware entitled "their god is too small: open theism and the undermining of confidence in god"
the book is a small paperback, less than 130 pages. it is a good introduction to what open theism is, what its proponents have written, and the consequences that such a belief demand.
if you are at all interested in this topic, i recommend it as a starting point. it is a pretty quick read, but covers a lot of ground.
to give you an idea, here is a link to the introduction to the book which, itself, is an excellent statement on why the god of open theism is a much smaller (i.e. different) god than the god of scripture.
read the introduction for free here
purchase the book here. (get a used copy for $6!)
as always, comments are welcome after you read the intro.