The iPod is a proprietary integrated product, although that is becoming quite modular. You can download your music from Amazon as easily as you can from iTunes. You also see modularity organized around the Android operating system that is growing much faster than the iPhone. So I worry that modularity will do its work on Apple.
Podcasting is not really that different from streaming music, which we've done for quite a long time. Having a traditional podcast that people subscribe to - the hype is ahead of the quality. Podcasting is essentially a download, and you run into copyright issues. What you're left with currently is podcast talk radio.
Humans pull together in an odd way when they're in the wilderness. It's astonishing how few people litter and how much they help one another. Indeed, the smartphone app to navigate the Pacific Crest Trail, Halfmile, is a labor of love by hikers who make it available as a free download.