Thanks to Naiah -- I'm going to read some more.
I've a longer post in me (I just need to find where I wrote it down in pen and ink when the computer was in the shop).
I guess I ought to toss in a good word for: Genderspeak: Men, Women, and the Gentle Art of Verbal Self-Defense by Suzette Haden Elgin (Hardcover - Oct 1993), especially since Amazon has it 33 Used & new from $0.59. The book is an interesting one. The publisher usually just does a single printing of books, sells them out and moves on. This one sold two printings before someone realized it was selling well. So, did they do a third printing? Nope, they just marked it off to good luck on a mistake.
Luckily you can buy used books easily now.
I also liked Crucial Conversations: Tools for Talking When Stakes are High by Kerry Patterson -- though the fun part is to have people who have read it immediately be able to apply it. I find it and the competing/completing Difficult Conversations: How to Discuss what Matters Most by Douglas Stone both good books.