As part of Knitgrrl's Kickstarter campaign for Cooperative Press, I got a digital copy of The Knitgrrl Guide to Professional Knitwear Design. This was a real bonus, as I was intending on buying the book myself. :)

The book starts with some marketing nuts and bolts - social media. With such a rapidly changing field, it's difficult to keep on the cutting edge in a book. The data is mostly up to date, but with a few minor things that have changed since publication (like automatic re-tweets on Twitter, for instance, and several references to the now-defunct AKD - Association of Knitwear Designers). There are also a few mentions of flash-in-the-pan internet phenomena - for instance, a subscription service which was started last year (!!), Patterndraft, which now has disappeared!
While the core ideas of the book are solid, I worry that parts of it will be less and less relevant as time goes on. Unless there are plans to release a new edition every so often, some sections will no longer be relevant, say, five years from now. Think about it: a little over five years ago, Twitter didn't even exist (it was launched in July 2006). Luckily, a digital copy can be easily updated as trends progress.
The book also covers more timeless topics, such as maintaining a professional persona, setting up multiple streams of income in addition to selling patterns, copyright, and formatting patterns. It's all really useful information - a lot of it I already knew, but some of it was new to me. Intriguingly, tucked in an appendix at the end of the book is a Book Proposal Template - a sample book proposal with notes about writing your own. If you dream about submitting your own knitting book to a publisher, this is a heck of a start.