So what's under discussion? What is political correctness and is it really the scourge of civil liberties that some commentators are claiming? Part of the problem is the definition: many people are talking at cross purposes, conflating arguments about removing offensive terms from the language with arguments about what are acceptable topics for discussion in a multicultural society.
So while most people are probably fine with the idea that calling people with cerebral palsy "spastics" or black people the n-word is unacceptable, and that PC alternatives should be found, many others would feel uncomfortable if they were told that it was offensive to discuss the problems of integrating white, black and Asian communities in inner city areas, or issues like treatment of women in different religions.
For more on political correctness check this link from Wikipedia and follow the links from there.
Useful for:
ENA1 - Language & Representation
ENA6 - Language Debates