From the early days of my preaching ministry, I have profited by the ministry of Preaching Today. PT is a ministry of Christianity Today. For a reasonable subscription fee, PT sends a CD with two or three sermons by respected evangelical leaders. Often there is included a workshop as well, discussing various elements of the task of preaching.
I have found this an excellent way of keeping in touch with the shape and nature of evangelical preaching as well as being able to hear the preaching of some significant leaders among us.
Check out the PT sermon transcript download page.