If you search our CakeCentral Galleries, under 'book', you will see a wonderful collection of book cakes, in all shapes and sizes.
Many of the people who posted the photos have given excellent details on how they achieved what they did.
Most people who post photos to the galleries are only too happy to answer direct emails from anyone wishing to know more about their cakes.
I learn a lot this way.
Good luck. 
Yes, wilton do them.
But here are some step by steps to help you out.
http://www.pieceofcakedecorating.com/2011/07/how-to-make-book-cake.html
http://thefrostedcakencookie.blogspot.co.uk/2009/05/graduation-cake.html
If you are good at carving, here is a video on making an open book cake.
http://www.youtube.com/watch?v=hpVnPIGDCTI&feature=related
HTH.
I DESPISE the Wilton book pan. It resulted in the only complaint about dry cake that I've ever received because the thinner "page" edges bake up hard when the higher middle is done properly.
I carve my book cakes from stacked rectangles based on the # of servings needed. I use a paper template to cut the "V" and curve. Very, very easy.
Rae
I did bake at a low heat. The corners were DRY.
It's reasonable to see that if it's 2" in the center and 1.5" at the corners, the corners could/would be drier than the center when the center is done properly.
For me, not worth the issue or risk when it's so easy to do it another way.
Rae
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