Just found something pretty awesome on the human ear. I like AIG's explanation of things, mainly because they reject the secularisation of everything and make the presupposition that God designed the universe as per the bible's explanation.
Then, using the ears we've just learnt about - check out the Truth for Life podcast, with frequent sermons by Alistair Begg. His stuff shakes up many incorrect assumptions very clearly but directly using the scriptures.
Another podcast you want to check out is that of Ravi Zacharias, called Let My People Think.