After being on the cards for quite some time, Richard Dawkins (atheist scientist chap & author of 'The God Delusion') and Alister McGrath (scientist theologian chap & author of 'The Dawkins Delusion') finally crossed swords in a public debate at Oxford on 21st March '07. In can be downloaded here:
http://www.timesonline.co.uk/tol/ audio_video/podcasts/books/ article1570989.ece

It makes interesting listening!