*****Commentaries that correctly explain the Catechism*****
Essentials of the Faith: A Guide to the Catechism of the Catholic Church by Alfred McBride, O. Praem.
A Concise Companion & Commentary for the New Catechism by James Tolhurst
The Mystery We Proclaim: Catechesis at the Third Millenium by Msgr. Francis D. Kelly Essentials of the Faith: A Guide to the Catechism of the Catholic Church
New Vision, New Directions: Implementing the Catechism of the Catholic Church by Robert J. Hater
The New Catechism: Workshop Resources by Sr. Mary Ann Johnston, National Catholic Education Association
The New Catechism: Workshop Resources A Moment of Grace by John Cardinal O'Connor
*****Commentaries that contradict and undermine the Catechism*****
The Catechism: Highlights & Commentary by Brennan Hill and William Madges
Commentary on the Catechism of the Catholics Church by Michael Walsh, ed.
Exploring the Catechism by Jane E. Regan
Introducing the Catechism of the Catholic Church: Traditional Themes and Contemporary Issues edited by Berard L. Marthaler
The New Catechism: Analysis & Commentary by Andrew Murray, ed.
For an explanation of the importance of this issue, please see my review of Flawed Expectations
A copy of Flawed Expectations for $17.95, while supply lasts, may be ordered by calling 1-800-MY-FAITH.
Footnote: Resources for Christian Living (Allen, TX) has recently published a Catechism Workbook called Our Catholic Identity. The Ad Hoc Committee to Oversee the Use of the Cathechism, National Conference of Catholic Bishops, has found it to be "in conformity with the Catechism of the Catholic Church." However, this finding of conformity does not mean "complete." For example, what this text says about the sixth commandment is vague and avoids any mention of Catholic teaching on pre-marital sex, birth control, homosexuality. Nor does the finding imply overall endorsement of RCL. Its website indicates connections with organizations known for dissent on these and other issues.
On the other hand Ellen Rossini's 100 Activities Based on the Catechism of the Catholic Church is recommended without reservation.