Supertop has Castro: High Fidelity Podcasts (iTunes Link) for the iPhone and iPod Touch in the iTunes App Store for FREE (regularly $3.99) for a limited time.

Castro is a revolutionary podcast client that’s smart, focused, and exclusive to iOS. It features a gesture-based interface that puts content front and center, episodes timeline makes it easy to find the latest episodes of all your podcast, continuous play option to automatically play the next episode, voice-optimized playback speed algorithm makes podcasts sound incredibly good when played at fast or slow speeds, and much mroe