The Next Web points to a Tweet from developer Shahruz Shaukat noting that the desktop version of iTunes is currently experiencing an interesting glitch in which searching for "podcast" or "podcasts" in the U.S. iTunes Store yields only a single app result: Apple's own Podcasts app. Clicking through to "See all" under both iPhone and iPad apps similarly displays only Apple's app.
Default results showing only Apple's Podcasts app
Filtering results to show only apps displays full set of results
Article Link: iTunes Store Glitch Limits 'Podcast' Search Results to Apple's Own App