NetNewsWire, my preferred RSS reader, isn’t particular about the file type within a given podcast. Audio (podcasting), video (videoblogging), images, pdfs (like 101sheets), torrents, or even applications (appcasting?).
As you can tell from the appcasting link, Fraser Speirs was the first I knew of using an RSS feed to distribute his excellent iPhoto Flickr plugin. More recently, the new version of Coding Monkeys’ SubEthaEdit came through their News feed.
Brilliant, this makes RSS 2.0 is the universal format for distributing updates of anything. Ultimately, I’d like to see the SubEthaEdit feed integrated into SubEthaEdit, same for all my other apps. Then we can get rid of those ever awkwardly implemented ‘Check for New Version’ menu items.
Bonus link, WP-GotLucky, another WordPress plugin I spun together, turns Google referral queries into an RSS feed. Making search engine performance more real-time and more visible than my server log analysis program supports.