Christianaudio.com has available for free download during November the unabridged audio book Religious Affections by Jonathan Edwards — free registration required, use coupon code NOV2007 (see free audio page each month for a free download)
Preaching Points Podcast is a fairly new and brief podcast from Gordon-Conwell Theological Seminary, that seeks to encourage preachers toward preaching excellence — Haddon Robbinson is one of the participants (via UW)