In the US alone there are over 60 million listeners. Up 23% from last year.
One in four Americans ages 12-54 listened to a podcast last month
Weekly podcast listeners consume five shows per week on average
Audacity is a free software source allowing you to create your own podcast.
When it comes to sharing your content you can use SoundCloud to share across you blog, Twitter, Facebook and Tumblr.
So go for it! Start small and simple and go from there.