Want more social justice in your (science-)fiction? Itching to know how to write write about people of different abilities, religions, races, ages, sexual orientations and so on? Or how *not* to do it? There's a book for that!
It's called "Writing the Other" and it's *finally* available for PDF-purchase. It's by Nisi Shawl and Cynthia Ward. See link.
http://www.aqueductpress.com/books/WritingTheOther-Vol8.html
It's full of exercises and good advice.
For some reason it decides not to deal with class (although it can easily be put to use to address class divides), and it has a piece of fiction in it that's entertaining but not the best use of e-paper.
It is one of my favorite books.