I have books on my wish list that basically be had for the price of postage, and sometimes will order up a few, especially before Christmas when I might (or might not) give them away as stocking presents after reading them myself. Books received are assumed to have been read by the giver in our family. I hear that is considered impolite by some, but it only seems sensible to us.
Language Myths is about 15 years old, has an English/Canadian/Australian slant, and is pretty basic. There are twenty essays on common false beliefs:
The Meaning of Words Should Not Be Allowed To Vary Or Change
Some Languages Are Just Not Good Enough
The Media Are Ruining English
French Is A Logical Language
English Spelling is Kattastroffik
Women Talk Too Much
Some Languages Are Harder Than Others
Children Can't Speak Or Write Properly Anymore
In the Appalachians They Speak Like Shakespeare
Some Languages Have No Grammar
Italian Is Beautiful, German Is Ugly
Bad Grammar Is Slovenly
Black Children Are Verbally Deprived
Double Negatives Are Illogical
TV Makes People Sound the Same
You Shouldn't Say "It is Me" Because 'Me' Is Accusative
They Speak Really Bad English Down South and in New York City
Some Languages Are Spoken More Quickly Than Others.
Aborigines Speak A Primitive Language
Everyone Has and Accent Except Me
America Is Ruining The English Language.
If you believe any of these myths, then I guess you need the book. If you don't, then I guess you don't. Not much new or advanced. Some of these are more commonly held by liberals, some by conservatives. There were some silly things written in the essays about women speaking too much and blacks being verbally deprived, but they are still myths, and the authors covered the territory.