I don't know if you have heard or heard of James McDonald (of Harvest Bible Chapel) but he is a powerful preacher of the Word of God.
I urge you to download this sermon by McDonald called "God Energizes Preaching."
Download it, please and listen.
In this sermon, McDonald does a masterful job of defining and discussing the importance of preaching and the fact that God has ordained it to be practiced by His church and that He works mightily through preaching.
In this sermon he addresses the preacher and the preached. The whole sermon is worth its weight in gold.