In his Google Earth Blog, Frank Taylor pointed out a new real time news layer in Google Earth from the New York Times. This layer opens automatically-- no need to download a KML file-- provided you've turned on the "Geographic Web" layer. Frank also referenced one of his earlier blog posts about CBS News providing an RSS feed of a KML file that can be saved in Google Earth. Check out the picture: there are recognizable icons for both organizations. Clicking one opens up a "bubble" like the one shown here.
All of CBS' RSS feeds may be found here: http://www.cbsnews.com/stories/2005/01/12/utility/main666437.shtml
Near the bottom of the list you'll find the Google Earth feed along with instructions on how to use it.