Podcasts have emerged as a valuable tool for project management related education. They are a simple method of delivering pm-based thought and education to the project management community at-large. This is especially true for those practitioners among us to whom geography or scheduling is a roadblock.This is why it has been possible for you as a PMP® to claim Category 2-SDL PDUs for listening to project management related podcasts. This has been in effect since 2006.
One more relatively easy way to free PDUs. However, you need to make sure you don't have anything else in this category.