I think this link came from Harold Laser' collection. I blended Harold's list with my own, so I'm not sure.
This essay is a helpful list of the common questions asked by unbelievers, along with a quick stab at an answer.
The more important point is that the site is valuable. LeaderU is sponsored by Campus for Christ, so it leans heavily toward William Lane Craig's philosophy, for example. It's a good resource, do a little browsing and bookmark pages that stimulate your thought.