This is a good start but leaves out some really useful features of Photoshop. One of my favorite newly discovered features is layer comps!

If you're addicted to photoshop but also want to display your designs somewhat interactively and minimize layer clutter, open photoshop and go to Window > Layer Comps. It lets you create multiple states within the same document, including layer positioning and layer styles. Great for button states or for preserving an entire flow through an interface in the same document. Have fun!