In the area of apologetics/theology is going to be "The Dividing Line" (from Dr. James R. White). He has written many books in the area of theology, and is a strong defender of the doctrine of the Trinity. His podcast streams on Tuesdays/Thursdays.
Greg Koul is the president of "Stand to Reason" and has a weekly, 3-hour long podcast. He approaches apologetics more so from the view point of philosophy, and is a CLEAR communicator.
There's a ton more out there, but I think those are 3 of the best!
Enjoy!
W2W
RC Sproulis a Reformed Theologian who has a daily podcast (Renewing Your Mind) that is a combo of classroom lectures, and sermons. A fantastic teacher!
Apologetics.com is a group of guys from SoCal who engage in the area of theology/philosophy/ethcis, and do so from a relevant/contemporary standpoint.