PUBLIC MARKS from Spone with tags "web app" & html5

HTML5 introduces new methods for enabling a web site or web application to function without a network connection. When you’re working on a mobile connection and your signal drops, or you just have no connection to the internet for whatever reason, having some level of access is better than nothing. In this article, we’ll look at how the application cache can store resources to be used by the browser when it’s offline, granting your users partial access to your web site or application.

Web apps that work offline are still uncommon, and there aren't a lot of "real life" implementation examples on the Web.