The idea of Podcasts took off and was used widely to relay messages about certain topics that listeners are interested in. Compared to the traditional methods of reading a book, a Podcast can be listened to while on the go, making it a more desirable way to get information on a topic.
Even more effective than Podcasts are videos. Easily created in iMovie, you can create a video that pertains to any subject you choose. As someone who uses iMovie frequently, it's extremely user friendly and makes it easy to create and edit video so it looks professional. The reason I rank video higher than Podcasts is from my own experiences. There are always Podcasts on how to do something- manage money, build a deck etc. I find, however, that it is easier to comprehend what the subject is saying if they are on video, allowing for mannerisms and visuals that a Podcast does not.
For example. check out this video of how to mow stripes into your lawn: https://www.youtube.com/watch?v=hcMD72YAv-I
Now imagine trying to understand that through a Podcast. It may work, but it's a lot easier when explained in this video.
With all the changes happening in the online world, I think we will see more videos being used across the board to explain, enhance and excite users.