XML, XSLT, RSS, Atom, etc.

In a world where software goes through a generation every 18 months and you can't predict what you'll want to do tomorrow with today's data, XML is a safe haven. XML: Three letters that every CIO should know

NewzCrawler is an RSS/ATOM reader, news aggregator, browser and blog client.

All about RSS from Radio UserLand's site

FeedBurner is an RSS/Atom post-processing service that allows publishers to enhance their feeds in a variety of interesting and powerful ways. By republishing their feeds through FeedBurner, publishers gain detailed feed statistics, maximum feed format compatibility, "shockproofing" to absorb bandwidth spikes, and more.

RSS 2 Specs and examples from Harvard University.