Evaluating Or Testing Utility SCADA Security?
Any security engineer / technical security auditor worth his salt will a) point that out to you in a meeting b) prove it to you through pentesting if needed.
SCADA systems in general are on the more .. interesting side from a security testing point of view, as one has to be _pretty_ careful about any side-effects caused by the testing. Been there, done that, haven't (yet) caused any major disasters.. ;)
Microsoft Tag, Smartphone-Scannable Barcodes
As so many digital-age inventions, this has been done in Finland ages ago. :) There's even a company whose business is built around it: http://www.upc.fi/en/upcode/
Linux Device Drivers, 2nd ed. Released Under GNU FDL
Yeah, even though the book is freely available, I for one like the feel (and weight ;) of a good brick of a book in my hands / on my lap / desk when I am doing some research.
The online edition is extremely good for browsing before you buy, and also acts as a wonderful reference (can't do regexp searches in printed books, too bad :)