iPod Cocreators
It appears that when Apple spotted this trend, it wrapped an experience around it and launched a directory of Podcasts. Apple generates no revenue, but supports the cocreation in order to promote the iPod platform, sell more iPods, and create a crossover effect to its music store.
Customers want a role in cocreating a product experience. Companies can ignore it, let it happen on its own, or step in to embrace it and control the context. Apple's strategy here appears to support the do-it-yourself content creation that continues to make the iPod a winner.