RSS: Really Simple Syndication
Started in 1997 as "scriptingNews" at UserLand.
RSS 0.90 developed at Netscape in 1999.
RSS 0.91 adopts most of the features from scriptingNews in 1999 and UserLand switches to RSS.
RSS 1.0 is published in 2000 by a "private group" and is based on RDF. It is completely different and unrelated to RSS 0.91 as it uses RDF.
RSS 0.92 is published in December of 2000.
RSS 2.0 is published through Harvard in 2003 under the Creative Commons license.
RSS 2.0 is basically a formalization of version 0.92