I read The Dialectic of Sex in high school.  I liked it, and then reread it a few years later and thought it was kind of silly – especially the chart at the end where she prophecied the end of oppression would lead to the end of death.  But it was formative for me and well-written – I think the first feminist book I read.

I don’t know what happened to my copy actually.  I may have to buy it again and give it a third read.

Here is a nice obituary which also describes a very tragic ending.  It’s where I got the photo.