Featured Apologetics Resources: CARM.org
CARM.org is the Christian Apologetics & Research Ministry of Matt Slick. The site itself is a treasure trove of resources, with articles on all of the key apologetic issues: Cults, Bible difficulties, Heresies, Atheism, and many more.
In addition, CARM has its own podcast/radio show. SermonAudio here. Or check out the RSS feed here.
Enjoy.