An enhanced podcast includes a video track that you can fill with images, timed to appear with certain cues in your audio track. GarageBand allows you to add images from your iPhoto library with its Media Browser or you can bring in photos from another folder on your computer.
1. Open the Media Browser by clicking its button in the lower right of the GarageBand interface.

2. Make sure the Photos tab is selected.
3. Drag an image from your iPhoto Library to the Podcast Track in your GarageBand project.

Note: If you would like to use images located in a folder on your computer, navigate to the folder and simply drag images to the Podcast Track like you would with the MediaBrowser.
4. Each image inserted will take up the length of the Podcast Track from insertion point to the out point marker. Drag subsequent images on top of the preceding image at each desired insertion point, working from beginning to end for best results.
5. To resize the length of inserted images, use the resize tool in the timeline. (See: Resize Regions)

6. You may preview your enhanced podcast by clicking the Info button, located beside the Media Browser button. This will show all information about your podcast, including images, as you play through the timeline.