I’ve rebuilt the Chap Magazine‘s site. It’s responsive. If you compare it on mobile, tablet, then desktop, you’ll notice increasing amounts of story teasers on home/section pages, as well as increasing (true) image sizes.
It uses my Responsive Content jQuery plugin to achieve this. You can emulate the different device sizes – and see the resulting content that gets loaded – from your desktop browser by adding #emulator to the URL, then resizing your window.