Rick Sammon has released a great new mac app about HDR photography. It’s not an editing program but is more of a teaching program. It has been designed to teach you how to use Photomatix Pro, Nik HDR Efex Pro, Topaz Adjust and even Pro HDR for iPhone. So, if you want to learn more about HDR phtoography, download this app – it retails for $10.99/£6.99 and you can pick it up here.