This is an interesting app as you may want to stream live content but do not want to show yourself or do not have time to setup a recording studio in your house. Groups can be created and your audience can interact live with your streaming and participate as guests.
Zcast is brand new so there is not currently a lot of content, as I write this post. I will give it a try later today. We'll see how this new podcasting media will workout. Personally, I have an interest of streaming live while I do practice my guitar every now and then.
Search for "Zcast" in the AppStore for the iPhone. For now, an Android version is still not available.
Have a great day!