The other book I think people are referring to is "God Is Not Great" by Christopher Hitchins.
The God Delusion is the better book, in my opinion. Hitchins rubs me up the wrong way in general by being scathingly condescending to anyone who did not have the glittering good fortune to be born as him, and his book is ranty and directionless.
I agree that Dawkins can come across as quite sledgehammery, but I think that is a symptom of his popularity. He's become the voice of a whole intellectual movement, so he has to make very sure that he says nothing at all that could be quoted out of context, otherwise he'd have all the Creationalist loons publishing "Dawkins says God not so bad after all" everywhere. I think an example of that (possibly given by Dawkins but I don't have the book with me) is that it drove Einstein nuts to have "God does not play dice with the universe" quoted again and again as evidence of his belief in God, when it was no such thing - he was just trying to get across the concept of physics poetically but everyone took it literally.
In some of Dawkins's essays he is quite clear that while religion has produced some wonderful things (I think the example he gives is Bach's music but it would be equally true for the Bamiyan Buddhas), it is a concept that is not relevant now, it has become dangerous and should be abandoned.
Sam Harris is much more thoughtful and eloquent than Christopher Hitchens on the same subject, and like Dawkins, a scientist by training. Hitchins seems to take the "you must be stupid to believe this crap" line but never actually engages in any deeper examination of what exactly is wrong with religion. It's really just a personal attack on anyone who's religious.