I'm thinking those guidelines supplied by Drew and a sufficient knowledge already gained in producing a good mix will save you the price of another Bob Katz book.
It isn't complicated at all, tags are not complicated, destination formats are not complicated if you know already what is required to produce final output for that format.
You'll notice if you read the guidlines that mp3's are old hat and Apple have been moving toward embracing higher quality and lossless file formats, with AAC being their format of choice for a good while now. Needing to make any decisions about the mp3 compression has never been an issue because it's dependent on the encoder and one mp3 encoder is normally as bad as any other. The best decision to make about mp3's is not to use them.
Tagging for iTunes offers more scope as well if you read the guidlines and see the way music is presented both on-line and off-line and I think you'll find that tagging is by no means under-utilized by artist or followers alike.
You might realize that much Mike when you start streaming some stuff instead of clinging to the idea that a static download on a web-server is still the best way forward as far as connecting with an audience goes...
It isn't rocket science to read instructions, it's what you do when you supply media to anyone that wants it in order give 'em what they are asking for.
Mystery and complication is usually introduced to make things seem insurmountably difficult often when somebody is trying to sell books at $30 a pop or because they like engaging in windy debates, the rest of us can just happily do what's required as laid out.
Good ol' Bob comes from a time when specialist skills and equipment were essential in providing quality output, these days none of it is beyond the ken of your average savvy singer songwriter.
I can't blame him for writing a book though as many people like to sanctify things by making them seem more difficult, even to themselves, there's still some financial mileage to be had out of that.