Photoshop CS6 One-on-One: Mastery Nears Completion

Photoshop Top 40, Feature #34: Save for Web (and Devices)

If you're creating Web graphics, there's no substitute for Save for Web. It disposes of non-essential data, reduces file sizes to their absolute minimum, and converts the image to sRGB (the color space of the people).

Photoshop Top 40, Feature #39: Layer Comps

Feature #39 is layer comps, which let you assemble multiple image variations or even independent pieces of artwork inside a single Photoshop file. One palette gives you the freedom to explore.