Podcast subscriptions have topped the one billion mark at the iTunes Store, To celebrate the milestone Apple highlighting popular shows dating back to 2005 when the podcasting section was first added to iTunes, notes “The MacObserver” (http://tinyurl.com/laglj3m).

Featured content in the classics category includes NPR shows “This American Life” and “All Songs Considered,” Mondo Media’s “Happy Tree Friends” and HBO’s “Real Time with Bill Maher,” among others. The one billion subscriptions podcast list is also available through Apple’s own Podcasts app for the iPhone, iPod touch and iPad.