Prism is a XULRunner based browser that hosts Web applications without the normal Web browser user interface. WebRunner is based on a concept called Site Specific Browsers (SSB). An SSB is an application with an embedded browser designed to work exclusively with a single web application. This application will be located in the Start menu on Windows. Fill out the URL of the website you want to turn into an application, give it a name and select where you want the shortcut to be created, then click OK.
Very nice and handy idea, felt like I was looking for it.
I don't like opening new browser page when clicking hyperlinks.
I suggest to open these links inside the application, and to open links under other domains in new browser page. And it'll be very nice to give the ability to ban opening links from other domains, thus it can be used for safe browsing for children for example.