Check out our interview with Reading the OED author Ammon Shea about his new book, Bad English: A History of Linguistic Aggravation.
My personal favorite language-police fact: people used to get really mad about the WORD “television” (instead of the programming, how novel) because it combines the Greek “tele” and the Latin “vision” — Manchester Guardian editor C.P. Scott famously harrumphed, “Television? The word is half Latin and half Greek. No good can come of it.”