This blog was created to help you understand the basics of Photoshop. It should be set up in a way where you can navigate through the Archives on the left side to read the oldest post first and continue to the newer ones to learn how to use certain tools and gain the knowledge to expand to harder projects.
I present little projects where you can work alongside instructive pictures I've taken of myself doing the the same thing. As the posts come I will offer more difficult tasks and explain more tools for performing them.
I use Photoshop CS5, but CS4 is so similar you shouldn't have any issues if you're working with it.