For podcasts, the app you want is Stitcher. Most any podcast in the world is available there, so if you want a cool distraction or need to research how to do anything, there’s a great resource. And Stitcher is free.
Not on Stitcher (yet) but available through iTunes: The Creative Penn podcast. Joanna Penn interviews helpful people on all aspects of publishing. And she’s a great interviewer, too.
Twitterific: The interface on this app is better than Twitter. I like it very much.
Wolfram: The smarter search engine.
And a sampling of music to write by: Fountains of Wayne, Eminem, Cee lo Green’s F**k You, Earth, Wind and Fire, Daft Punk’s Technologic, Journey, Pet Shop Boys, Freeland’s We Want Your Soul, Queen, old Stevie Wonder, and the immortal Weird Al’s White & Nerdy (see Donny Osmond’s dancing on the YouTube video for full effect.)
- Stitcher Makes On-Demand Streaming Simple (audio4cast.com)