Photoshop CS3 Extended introduced several groundbreaking features that set it apart from its predecessors and competitors. One of the most notable additions was the integration of 3D capabilities, which allowed users to easily incorporate 3D models into their 2D designs. This feature opened up new avenues for creative expression and technical visualization. Additionally, the software included enhanced support for HDR (High Dynamic Range) imaging, allowing for greater detail and realism in both photographs and digital art.