I'm starting to do some things with Adobe's InDesign for a couple of projects I'm working on. One immediately cool feature I've found–it can save documents as W3C compliant CSS. Another–it can import and export XML content like RSS. So, in theory, with some scripting, you could suck in some RSS feeds, process them with InDesign, and output print, PDF and web content from it. Ta daaa: A print 'zine from RSS channels

Theoretically. I still have to dig a little deeper.