That's weird because http://blog.digg.com/robots.txt does not cloak. Why cloak one and leave the other?

  Sitemap: http://blog.digg.com/sitemap-pages.xml
  Sitemap: http://blog.digg.com/sitemap1.xml

  User-agent: *
  Disallow: /private
  Disallow: /random
  Disallow: /day
  Crawl-delay: 1