John Piper, the pastor for preaching and teaching at Bethlehem Baptist Church in Minneapolis, MN has just begun a sermon series, which if I understand correctly, will continue all the way through the book of John. The first sermon in the series is titled "In the Beginning was the Word" and is available free of charge for download (video, audio and text) from his ministry's website.
I had the chance to listen to it this morning and I high recommend it. Note: if you go to the link above you will also notice that there are links to the podcast versions of Piper's sermon audio and video as well. If you subscribe to the podcast, you will automatically receive the download of the sermon just a few days after they have been preached.