Gabrielle's Bernstein's books helped me with self-esteem. They're new-agey, aimed at women, and I outgrew them after a while. However, they were very good with improving self-esteem and self-acceptance. There's no "one size fits all" in the self-help arena, and all books have their strengths and weaknesses. E.g. Bernstein's books were very good at the specific issues I mentioned here, but not so good for other things (e.g. they're not really aimed at people with mental health issues, those who are seeking deep spirituality, etc).