This afternoon after church I listened to another a sermon from Willingdon Church in Canada. It was very good: about knowing what we believe (the Gospel) and how to present it to others.
If you are already a christian I would urge you to listen to it as it helps us to know the assurance of our salvation, and if you are not a christian, I urge you to listen to it so you can see the importance of committing your life to God, and the implications if you don't. It goes for about 45 minutes and is a very beneficial and uplifting way to spend a sunday afternoon.
The link is here. If you click on the symbols at the bottom of the page you can either listen to the sermon or watch the video.