Chrome Web Store and Web Apps

Nelson Minar points out that there are two kinds of web apps in the Chrome store: hosted app and packaged apps. Hosted apps are normal websites that can be loaded using any web browser. Packaged apps only live inside Chrome: they work offline and they use the extensions API to integrate with the browser. You can easily tell a packaged app from a hosted app by looking at the address bar - if there's no URL, it's a packaged app.