Planning A Podcast

While 'podcasting' seems to be a "new" type of lesson technique, much like teaching a lesson using the production of a 'flip video', the real technique for spawning learning comes from the planning & creation of an 'authentic problem'. Podcasting, like any other tech based learning activity can quickly lose the focus of being a "learning activity" without being anchored in a real(or seemingly believeable) problem or issue. Besides a "discussion series", I have found that developing an 'authentic problem' for which to build a podcasting activity around is the most challenging part of devising a lesson using a podcast. Or is it just a matter of knowing your subject matter better and merging that with some creative thinking????