The Cardmaker's Sketch Book is great. I just got it a week or so ago after JulieHRR mentioned it when she replied to a post a while back. Here's a link to it on Amazon.
http://www.amazon.com/Cardmakers-Ske...6956748&sr=1-1
The card sketches were designed by Tami Mayberry - an SCS member. I believe Tami also has something to do with the Card Positioning Systems website.
What I really like about the book is that there are sketches for different size and shape cards - and there are at least 4 pictures of cards as inspiration for each sketch. You'll know some of the names of the card designers as some are SCS members and well known bloggers! JulieHRR was too modest in her original post to say she had contributed some designs to the book!
I also have printed off the SCS weekly sketch challenges - they are fabulous too. It's wonderful that you can get the whole lot in two files, either a Word doc or a PDF file. Here's a link to the thread where you can get those files.
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