Why won't the New York Times "skimmer" web site run in Fluid?
Unfortunately, Fluid doesn't seem to work with that site (either to do with the HTML5 or the caching). However, Prism (http://prism.mozillalabs.com/started/) works the same way as Fluid (separate process, dock icon, etc.), and presents the content perfectly. It doesn't have many features, such as User Agents, Preferences, or Themes, but for something like Skimmer it looks great!
Hope this helps you,
Charlie