A service called Mouin makes it simple to build a native app using your existing website. Now to be fair not sure how many have this need but it’s worth a look. If you would like to build a native app using an existing website and all you know is HTML/CSS then this is a good tool for you. With a few changes to your HTML/CSS you can have native apps in iOS, Android, Blackberry and Symbian. From Mouin’s website it looks like the app can only present information and not have any interactive features.