Rich Site Summary [http://backend.userland.com/rss092] or RDF 
Site Summary [http://www.purl.org/rss/1.0/]. There 
are some heated debates [http://www.blogroots.com/comments.blog/172] 
about what RSS is but at its core it's an XML
syntax for providing summaries of news based websites. An RSS document 
consists of one or more channels with one or more items. Each item
is usually a news story with a title, a link and possibly a description. 
Newer versions of RSS [http://backend.userland.com/rss] provide for more 
properties for each item.




Steve's Wiki [http://www.ics.mq.edu.au/~cassidy/cgi-bin/wikit/]
has RSS capabilities. That is you can get the Recent Changes 
page as an RSS file. 



[Petteri K] offers
    lynx -source http://www.iki.fi/petterik/rss.cgi > rss.cgi
    tclsh rss.cgi 0b00 
as a demonstration of RSS capabilities.