We led this study a year ago at Guadalupe Hall (EWTN) and found it to be one of the best Bible studies we've ever offered. There is so much good information on the psalms that we're eager to go through it again--hopefully with a larger group.
The optional study guide is currently available at the following vendors:
Amazon.com
Ascension Press
Barnes and Noble
CommCenter
It is completely possible to go through the study without purchasing the study guide, but if you don't like taking notes, you'll probably enjoy the weekly "Talk Notes" that give you an outline of each session.
Hope you can join us--and help us spread the word!