What is a good resource for dealing with atheists and agnostics?

I wish to educate myself so that the next time I run into an atheist or agnostic I will be able to argue for the existence of God. What resource would you recommend?

I recommend starting with the following resources:

From the Catholic Encyclopedia:
The Existence of God
Science and the Church

From Catholic Answers:
Faith and Science Tracts
Handbook of Christian Apologetics

DISCLAIMER: The views and opinions expressed in these forums do not necessarily reflect those of Catholic Answers. For official apologetics resources please visit www.catholic.com.