_Mind Over Math_ by S. Kogelman and J. Warren (McGraw-Hill Paperbacks)
is very good.

Also check out:

A. Schoenfeld, _Mathematical Problem Solving_ (Academic Press).  More
scholarly but excellent section on belief systems and how they affect
math performance.  Available in many college libraries.

A. Schoenfeld, ed. _Cognitive Science and Mathematics Education_ (Erlbaum).
Includes an excellent article by the editor on teaching math metacognitively.

A. F. Gourgey, "Tutoring developmental mathematics:  Overcoming anxiety
and fostering independent learning," Journal of Developmental Education,
Spring 1992.  I included some good references on math anxiety as well.

Annette Gourgey (CUNY)