I pre-ordered this as soon as it was announced; in dead tree format, no less, as I was expecting to refer to it at a workbench. I ordered it partly because I thought it would be a useful get up to speed on the Pi I'd bought, but also because I wanted to put some cash the way of Upton, as he's one of the leading lights behind the Raspberry Pi foundation, even if it had been mostly 'ghostwritten' by Halfacre.
If I'm honest, I wasn't expecting it to be much; a few desultory articles on plugging things together, and a short guide to Python. It turns out that its actually a really great guide that I have and will recommend to anyone with, or planning to get, a Pi!
The authors have made a decent spread of topics of things you might want to know and do with your device. As I read through it I thought how much it would have motivated me in my CDT course at school, having one of these. Heck, I even wondered why we didn't prototype in the electronics component of the course - was breadboard around in the 80's? Must have been, right? Anyway, its kicked my hardware hacking interest up a notch, even with my interest in Arduino (and thanks to the book I know understand why the Pi might be good some projects, and the Arduino others), so I will be shopping for breadboard and the like this weekend to start my project!