Podcasting, being the ultimate DIY technology, is a bit scattershot at the moment. Competence mixes with incompetence, and it’s fairly difficult to distinguish the good from the bad without downloading and listening to everything you find. But “two new search engines offer to do for podcasting what Technorati does for blogs by letting users search podcasts by keyword to single out audio that suits their interests. Podzinger and blinkx scour audio content for keywords by translating the audio into text and creating an index for quick searching.”