For the podcasting page on Wikipedia (which I don't edit because I'm one of the people it talks about, or should).
Here's a screen shot of the RSS enclosures prefs page from Radio 8. As you can see from the timestamp at the bottom of the page it was last modified on 11/24/2001. It was created some time before that. Adam Curry, who wrote iPodder, three years later, was an avid user of this software.
Last update: Thursday, June 3, 2010; 4:00:29 PM
~About the Author~
Dave Winer, 55, is a visiting scholar at NYU's Arthur L. Carter Journalism Institute. He pioneered the development of weblogs, syndication (RSS), podcasting, outlining, and web content management software; former contributing editor at Wired Magazine, research fellow at Harvard Law School, entrepreneur, and investor in web media companies. A native New Yorker, he received a Master's in Computer Science from the University of Wisconsin, a Bachelor's in Mathematics from Tulane University and currently lives in New York City.
"RSS was born in 1997 out of the confluence of Dave Winer's 'Really Simple Syndication' technology, used to push out blog updates, and Netscape's 'Rich Site Summary', which allowed users to create custom Netscape home pages with regularly updated data flows." - Tim O'Reilly.