Or, for that matter, news from any RSS feed. This seems to work on any newsfeed, but here's an example of how to show MacOSXHints on your screensaver:
Change your screen saver to RSS Visualizer, in the Screen Saver tab of the Desktop & Screen Saver System Preferences panel. Now open terminal, go to ~/Library/Preferences/ByHost, and you'll find a file whose name starts with RSS Visualizer and ends with .plist. Convert the file into XML by using this command:
plutil -convert xml1 RSS Visualizer[press Tab to auto-complete]
Open the XML file in your favoriate editor, and locate this line:
<key>feedURL</key>
Under that tag, you'll find the URL of the RSS feed. Change the current entry to this:
http://www.macosxhints.com/backend/geeklog.rdf
Now save the file, and convert it back into binary plist format by using this command:
plutil -convert binary1 RSS Visualizer[press Tab to auto-complete]
Open your screensaver and there you go. One catch: The RSS screensaver doesn't seem to understand the 'feed' protocol, but changing that to 'http' seems to do the trick.

