Thanks to SC too

If you just want to know about Kabbalah then these books may be best:

1) Kabbalah for Beginners

2) A Guide to the Hidden Wisdom of Kabbalah

3) Basic Concepts in Kabbalah (There is also an audio book version )

4) The Path of Kabbalah 

5) Kabbalah Revealed 

For more in depth technical knowledge on the wisdom of Kabbalah, here is what I recommend:

1) Introduction to the Book of Zohar 

2) Science of Kabbalah 

3) The book of Zohar Annotations

Other Kabbalah books:

1) Attaining the Worlds Beyond (There is also an audio book version)

2) Kabbalah Science and the Meaning of Life 

3) From Chaos to Harmony

4) Together Forever

5) Wondrous Wisdom

6) Interview With the Future

7) Women and Kabbalah

8) Intentions from the Heart Audio Book in mp3

On top of these free e-books, they also offe