"Attraction Formula" by Paul Janka is the best one I've read.
http://pauljanka.net/
A lot of people here have read 'Mystery Method' and 'The Game'.. but I haven't. To be honest.. after reading attraction formula I didn't feel I needed to learn anything else.
Paul teaches that props, money and gimmicks are not necessary for meeting women. And he is right. I lost interest in reading other PUA material because this book worked so well for me.
But I'm sure 'MM' and 'The Game' are great as well. Definitely read them if you're interested.