I have just finished reading "Why Evolution is True" by Jerry Coyne. I seldom bother to review books here but in this case I'll make an exception. This was one of the very best discussions of evolution I've read since the passing of Stephen J. Gould a few years ago.
Not only does Coyne explain evolution in a clear, concise and easily grasped manner that is hard to argue with, he also specifically addresses many of the objections commonly presented by Young Earth Creationists and Intelligent Design advocates.
What he was not able to do, in my opinion, is make a plausible case for the origin of life itself. He postulated the "naked reproducing molecule" that then responds to natural selection and "voila!" LIFE! Heh, not even. I will give Coyne credit here though, he, unlike most of the more rabid fundamentalist atheist evolutionists, does admit that there are major problems with the experiments and ideas so far presented on the origin of life issue.
For me, I have no doubt but that the entire cosmos was designed by God, probably with the goal of creating human life here on earth. I actually like much of what they have to say at Reasons to Believe, not everything but much of it.
If you want a book to give you some ideas on how to talk about evolution with a creationist this is certainly a good one to get.