Show HN: my iBooks Author design and publishing guide

I wrote a guide to iBooks Author, Apple's digital book design software. I just posted it for sale on my Shopify store.

I'd greatly appreciate any and all feedback regarding my blog and Shopify store (both rough, I know), my website copy, the concept, the price, and so on.

Blog post about the guide: http://inkslingerindustries.com/2012/06/announcing-how-to-make-a-book-with-ibooks-author/

The guide in my Shopify store: http://store.inkslingerindustries.com/collections/frontpage/products/how-to-make-a-book-with-ibooks-author

Thanks!