That Ain't White by Matt Ray (American Sexuality Magazine), link found here in an entry by sinsense whilst lj hopping. It covers the etymology and histroy of the term "white trash" which, I'll be honest, I had no idea was actually pre-Civil War (for some reason, I was convinced it was Reconstruction, but I have no idea where I got that idea. Out of My Ass Encyclopedia probably).
The article covers the origins of the word and an interesting link with eugenics and the legalization of sterilization back in the twenties as well as current usage and misusage. The classism connotations I'm intimately familiar with, but the racial, as discussed in sinsense's lj, make an interesting addition.