As long as I'm talking about books, then two other books on par with "Practical Electronics for Inventors" (assuming a 2nd ed fixes mistakes and clears up the general initial poor editing) are:
"Getting Started in Electronics" - Forrest Mims
"Electrical Engineering 101" - Darren Ashby (Has a CD)
I mention these as not "I'm going to study to be an engineer" type of book, but more as the type of book that I think people on this board could turn to for guidance.
Also of interest to SoR members might be the "Evil Genius" series of books, in particular: Mechatronics, Electronic Circuits, 123 Robotics Experiments, and Electronic Sensors.