Very cool: free*, and right from the Photoshop 3D team:
Photoshop Dimensions is the magazine of 3D in Adobe® Photoshop®. Whether you are new to 3D in Photoshop or an old hand, Photoshop Dimensions will show you new and exciting ways to add another dimension to your work. Photoshop Dimensions is written by leading authorities and experts who truly understand Photoshop’s powerful 3D features.
In this free issue of Photoshop Dimensions, we look at the many changes made to Photoshop’s 3D tools in CS 6 that will speed-up your workflow and expand your capabilities.
*Update: The first version is free, and the second costs $4.99.