So last night, I started making good on the implied threat contained in yesterday's idle musings about Amazon S3. I've started building S3Ajax, an AJAX-based wrapper for Amazon's S3. Between S3, the OPML Community Server API, and what will hopefully come out of the Atom Publishing Protocol - I think web-based filesystem APIs have the potential to be a Next Big Thing.
Imagine if Amazon S3 offered filtered RSS feeds of new files uploaded to a bucket. And, imagine if that RSS feed listed those new files as BitTorrent enclosures, with a few item elements fed from metadata headers (ie. title, description, etc). Instant podcasting.
Also, imagine if Amazon connected an XSLT processor to S3 like they do with product searches. You could turn a bucket listing into an RSS feed with an XSLT uploaded to S3 itself.