- Simone de Beauvoir's The second sex (I've only ever read bits of this as it's pretty wordy and heavy-going)
- Mary Wollstonecraft's A vindication of the rights of woman (I read this as a teenager, but don't remember much about it)
- Betty Friedan's The feminine mystique - again, I read this when I was a student, but fancy rereading it
- Susan Faludi's new book The terror dream, about gender roles in America since 9/11
- Sheila Rowbotham's Woman's consciousness, man's world
- Élisabeth Badinter's XY, de l'identité masculine
- Virginia Woolf's Three Guineas
- Deborah Siegel's Sisterhood interrupted
Suggestions are welcome!
Edit: just want to add a couple of links to articles about inspiring feminist books: feminists name important books in the Guardian, and Guardian readers respond; the f-word has a similar article here.