What is Portable?
Portable means that this is a smaller version, with the same features and everything, that is so small that can fit your USB stick.
Portable also means that all you have to do is to extract the folder, and NO INSTALLATION NEEDED! after you extract you can start using it. which means NO KEY / ACTIVATION OR CRACK NEEDED! It Is So Simple!
Photoshop CS3 Extended Portable includes all of the same features as Photoshop CS3 but adds a brand-new set of tools and capabilities for the integration of 3-D models, video and animation, and image measurement and analysis.
In CS3, Adobe did a very good job of making interface improvements without moving too far away from the familiar. Most of the new elements unique to Photoshop Extended are well integrated into the standard Photoshop and accessed from familiar tools such as the Layers panel or various menus. 3-D compositing and texture editing.