Synopsis:     This week Mark and Shawn are by Steve Cherubino of the Podnutz podcast network for a great discussion of the art and science of podcasting. Sponsor: Power PTC   Use the discount code "tightwad" and get 20% off at checkout. Links: Podnutz.com Reaper.fm TIPS:   Tech Tip of the Week: WinX DVD Author   Teacher Tip of the Week: Khan Academy