We cooked up a special widescreen edition of the PDF for Digging Into WordPress 3.1. This new edition contains exactly the same content as the original, but instead breaking the spreads into single-page format, the widescreen version retains the same "two-up" layout, so it's just like you're reading the actual printed book. The pages are pretty wide, so probably best for readers with larger screens :)
Here are a couple of screenshots from the widescreen edition:
The new widescreen PDF is available as a free download for everyone who owns the book (either PDF or Print Edition). To get your copy, log into your account at our new Members Area and download at your convenience.