I read for the first time it when I was in high school, and it helped me like a hella lot. I have been an atheist since I can remember myself, but I live in a very religious country and it is hard to stay away from their beliefs. There are even lessons of religion in our schools, and it is terrible. So I feel an urge to thank Richard Dawkins for this wonderful book and for helping atheists all around the world to deal with such situation.
Furthermore, it's a sheer pleasure to read a book so well-written and structured and so informative. I've read it two times from cover to cover and tabbed and annotated the heck out of it.
All in all, I'm happy to have read it and gotten around the fact I'm not alone. There are many of us non-believers in the world, so we have to cooperate and spread our world perception and the scientific knowledge.
There is no God, once and for all. We, atheists, are the brave ones who can live up to that. Join us and break the superstitions!