Ah, I have heard of that. I might pick it up, or at least a summary, but I already have my doubts about Dawkins approach to the matter. Reviews I have read seem to suggest it does present atheism reasonably, but to keep it for a large crowd, the book does not delve extremely deep into a few arguments, angering many Christians.
I haven't read 'The God Delusion' since, like you, I don't think I'd gain anything from it. I do recommend 'Breaking the Spell: Religion as a Natural Phenomenon' by Daniel C. Dennett. It's a great look at the natural roots of religious ideas. Dennett's writing sounds like the most patient man in the world explaining a sensitive subject in a sympathetic tone.
If Dawkins' tactic is 'shock and awe', then Dennett's tactic is 'hearts and minds'.
For sheer breadth of scope though, might I suggest 'The Portable Atheist' which is a collection of essays compiled by Christopher Hitchens spanning thousands of years of atheistic thought.
And if you thought 'The God Delusion' has a reputation for confrontationalism that makes it worthy of a read: you might want to think about 'God is Not Great: How Religion Poisons Everything', by Christopher Hitchens.