I've returned from my first visit to the UK since I moved to Norway six months and ago and managed to dig out some more books from my parent's attic to drag back with me. I posted a list of all the atheist/sketpic/humanist/scientists I had managed to stalk a little while back and I've managed to root out a few more signed books, two of which, The God Delusion and The Meaning of Things have been massively influential to me.
The Meaning of Things by AC Grayling, at the Press Launch for the National Federation for Atheist, Humanist and Secular Student Societies (AHS) back in February 2009. It's Grayling's wonderfully thoughtful and accessible little essays that first got me seriously thinking about, well, the meaning of things.
The God Delusion by Richard Dawkins, also at the AHS Press Launch. Opinion might be divided about Dawkins' strident ways but, as with many other people I imagine, this was the book that solidified my atheism, and I guess made me more vocal about my love of science, lack of belief in God and critical views of religion.
The Moral Landscape by Sam Harris, at a conversation with Richard Dawkins in April 2009, where two of The Four Horsemen talked about how science might unravel and explain morality. Whilst I'm not sure I agree with Harris' ideas completely, it was great to hear the two talk them through in the beautiful arena of Oxford's Sheldonian Theatre.