Along with updates for OS X Mavericks and iTunes, Apple also rolled out an update for its iPhone Podcasts app on Thursday. Podcasts 2.1 added a new Unplayed tab that makes it easier to find downloaded podcasts you haven't listened to yet, and added support for using Siri spoken commands to interact with the app.
Apple adds Siri support to Podcasts app
The Podcasts 2.1 update also added a new Feed option for quickly seeing which podcast subscriptions have new episodes ready for download, support for sharing links via AirDrop, and added CarPlay support, too.
Podcasts is free and is available at Apple's iTunes-based App Store.