Here's the Kindle link:
Several of you have asked me for an e-book version, which is why I'm providing one. If this version proves popular, I'll do the work needed to convert the book to the other e-platforms. Unfortunately, the requirements for Nook and Sony Reader are completely different from those for the Kindle reader, and because the book is so rich in formatting, it's a job to do these conversions.
The Kindle version can also be read on iPads, iPhones, Blackberry and Android phones.
In response to your requests, I've also just uploaded a Nook version.