I've recently uploaded the tutorial Getting Started with the 3D Camera and Layers- 2. It's for After Effects 7.0 and higher. I go into a little more detail about camera blur and depth of field, as well as other ideas for bringing life to still images. If you haven't viewed the first tutorial, you can find it here.
If you have any questions about the projects and the technique, please post to Toolfarm's Expert Forums and I'll do my best to help.