Having now had a chance to watch Paul Tripp's conference DVD on marriage, I'd again encourage you to check it out. I hadn't noticed that WTS Books is now carrying both the DVD and the CD sets.
Here's a little trailer for it:
And here's a two-minute clip of excerpts from the actual teaching:
WTS Books also has some bonus videos with short answers by Tripp to some important questions.
Finally, you can download for free the Leader's Guide and Discussion Guide.