I will provide here a list of books and web sites I think might interest you. Some are specific to mindfulness meditation and others go deeper into Buddhist psychology.
MINDFULNESS IN PLAIN ENGLISH – Bhante Henepola Gunaratana (you can read it online here)
THE WISE HEART – Jack Kornfield (an interesting look at the differences between Buddhist and Western Psychology)
BUDDHISM WITHOUT BELIEFS: A CONTEMPORARY GUIDE TO AWAKENING – Stephen Batchelor (great introduction to totally secular Buddhist psychology)
WHEREVER YOU GO, THERE YOU ARE – Jon Kabat-Zinn (classic overview of mindfulness)
Here is a book I read this past summer which I found very interesting:
UNLIMITING MIND – Andrew Olendzki
Now, if you want to read something more deeply involved with Buddhist psychology and ideas you might try
SEEKING THE HEART OF WISDOM Joseph Goldstein & Jack Kornfield
DANCING WITH LIFE Phillip Moffitt
and if you really want to go into the subject, let me suggest this site…
…and this site – which has a number of talks by Western Buddhist teachers – probably the largest collection available.