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Author Scott Onstott published a Book on How to Enhance your CAD Drawings Using Photoshop. Beeing this one of the main processes we usually do I think it was worth mentioning here.
The book has great reviews and it is probably the only one facing this subject directly, so many architect will find it very useful to streamline the way they work daily with this two tools.
The book even comes with an AutoLISP routine to translate AutoCAD layers into Photoshop ones. You have to be careful when you use this routine since it might crash your drawing if you don't have a powerful machine, but it is an efficient tool.
If your regular work scheme involves drafting in CAD and then coloring drawings in Photoshop you should definitively give this book a try. It is worth the price.