While troubleshooting a home network issue today, I stumbled upon a new feature that Apple is introducing in OS X Mountain Lion. Many have referred to the Safari Reading List feature that debuted in Lion and iOS 5 as a glorified list of bookmarks. That's kind of true, although Reading List can also let you know which items you've read and which you haven't, and also gives you a text preview of each item as well. However in Mountain Lion you are able to read your Reading List items even when you're offline.
When you aren't connected to a network and pull up Safari, you get a message that tells you that you aren't connected to the Internet, but that your "Reading List articles are available for viewing while you are offline." Definitely a nice bonus when you wanna read some stuff but have no way of browsing the web.