possibly... even the ppl who know everything about computers could learn some stuff from books - and even if they did know everything from the book... who's to say they do it the same way (always nice to learn variants on various methods )
what isn't? unless you have dialup, just download it and put it in the background. it doesn't take any effort from you.
and i find it plenty informative. and it has tons of pinouts of every connection you'll find... scsi, ata, firewire, usb, all power supply form factors, etc etc... even the pins of different processors.