Here a two videos briefly introducing the teaching of Paul Tripp on marriage. Paul Tripp is one of my favorite authors; I've mentioned him before in the context of child rearing. He and his brother Tedd Tripp have a video series and book called Shepherding a Child's Heart. I believe this is the best stuff out there.
Here's a preview for The Case for Kids, which is the Shepherding a Child's Heart material turned into the DVD.