I really like the idea of a printed book. For me they are easier to read and more portable.

As far as content: I really think there should be a programming practices, methods, and conventions section. One idea would be PICBasic "standard practices." Writing simple programs that blink an LED are simple and easy when you start scaling up from there you start running into interrupts, timers, and code size issues. There is no documentation on how to layout a program logically, what methods to use, or the big picture of embedded programming. I think a big overview of good programming practices might be nice, basically dos and don'ts of PICs and programming.