I was just looking around on the website about The Digital Show for some information when I found this. You're suppose to open the catalogue to find this link, but I knew you'd all appreciate skipping that tedious step.
You have a choice of mobi or epub formats.
Note from The Digital Show website:
"BONUS: download your copy of the Digital Show Catalogue 2012 for a link to a FREE copy of Mastering Digital Photography ebook (RRP $9.99) - everything you need to master the fundamentals of digital photography."
Thanks downloaded to my iBook.