So glad you started this thread. I've recently started researching good feminist books as have become aware that despite always having called myself a feminist, I have been mistaken in believing that the fight for women was practically won due to my own decent experience of life.
Pregnancy, babies and facing the reality of my biology and all that it entails has really changed my perspective over the past couple of years.
The suggestions on this thread so far are great. Quite a few form the basis of my mother's feminism but despite them sitting on the shelves growing up i haven't read Greer or Klein yet.
Dworkin, I've only since this summer become aware of but sounds formidable.
At a stage with little time for reading at the moment (babies & own business) but here's my wish list so far:
Michelle Goldberg
The Means of Reproduction: Sex, Power, and the Future of the World
(Seems like a fascinating and in depth read. I discovered the author from some of her journalism, which was impeccably researched and very readable)
Sheila Jeffreys
Gender Hurts
(This book has been very controversial and I understand there was a lot of effort to have to censored. Routledge press didn't cave in and published it regardless)
Cordelia Fine
Delusions of Gender: The Real Science Behind Sex Differences
(Already mentioned I know)