I was intending to write a review of Rob Bell's latest book, Love Wins. However, this Evangelical Alliance review is pretty much exactly what I would have written, so just read that instead.
I shall only add this, quoted from my review of The Shack:
Having said that, of course he is a heretic. Yes, the book is good, but yes, there’s also heresy in there. But so what? I doubt there’s ever been a book written (Bible excepted) that doesn’t contain some heresy. People, chill out a bit! Books are written by humans, they’re going to have errors in them! But that doesn’t mean all books are worthless! This book (and Chalke’s) are really good and well worth reading. Neither book is perfect, so you have to read them carefully, take the good stuff, and dismiss the misleading bits.