The Photoshop TV podcast receives about 2 million downloads a month. If you create a podcast with a how-to focus, your popularity will explode. People search for information, research, knowledge. They want to learn how to do things. http://www.printondemand.com/MT/archives/008610.html
I think all the podcasts on the idratherbewriting should convey this how-to focus -- as much as possible anyway. Most topics are really how-to, although they aren't titled as such.
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I'm a technical writer based in the California San Francisco Bay area. Topics I write about on this blog include technical writing, authoring and publishing tools, API documentation, tech comm trends, visual communication, technical writing career advice, information architecture and findability, developer documentation, and more. If you're a professional or aspiring technical writer, be sure to subscribe to email updates using the form above. You can learn more about me here.