If you are just getting started with GTD, we recommend any of these:

• GTD Live—David Allen presenting his classic seminar: GTD: Managing Workflow, Projects & Priorities.

If you already have a foundation or at least some familiarity with GTD, we recommend any of these:

• GTD Weekly Review Set—a terrific set of recordings to teach, support and coach you through the critical success factor to GTD: The Weekly Review.
• Managing Projects—an in depth look at managing and planning your projects with the GTD models.