Following a link from my friend Marius Cruceru ( www.mariuscruceru.ro) for some sermons by Don Carson, I found this great resource for Christians: The Gospel Coalition. This is a website that is definitely worth exploring and using for your personal growth. I just downloaded a series of 3 sermons by Don Carson on The New Perpsective on Paul. I think it should be great to listen on this topic from one of the greatest NT scholars in the world.
You can find on this site sermons and other resources from some of the greatest Christian communicators in North America: Don Carson, John Piper, Tim Keller etc. You can do a search by Scripture Index. A quick search for the book of Ecclesiastes (one of my favorites) has found a series of (what looks to be) great sermons.
Take a look and let me know what you think about this.