New High School Religion Course of Study 2011 documents here:

New High School Course of Study (107 pages)
New High School COS Chart
New High School COS cover page
Bishop Blair's Letter New COS

Some Suggested Texts:

Midwest Theological Forum - the Didache Semester Series page
Ave Maria Press - high school texts page
St. Mary's Press "Living in Christ" textbook series


Key USCCB Documents:

Check the following list from the US Bishops' conference for additional texts that have been approved for conformtiy to Catechism: 
USCCB Textbook Conformity List


USCCB Doctrinal Framework document 
USCCB Chastity Formation document
 



Other School Catechesis Resources:

Course of Study & other diocesan documents (PDFs)

Scripture
Creed
Sacraments
Moral
Prayer
Sacramental Preparation:
Diocesan Policy for Sacramental Preparation (PDF)

Baptism
Confirmation
Eucharist
Reconciliation
Rite of Christian Initiation
RCIA Diocesan Handbook (PDF)  (available from Office for Divine Worship)


US Bishops' Catechetical Guidance:
List of texts conforming to Catechism per US Bishops
US Bishops' Catechetical Framework for High School Age Materials
US Bishops' Guidelines for Catechetical Formation in Chaste Living

Publishers with Materials on Bishops' Conformity List:
Ave Maria Press
Catholicism Series - CR Publications
Consecrated in Truth Program
Midwest Theological Forum - Didache Series
Faith First
Pflaum
Ignatius Press Religious Education
Loyola Press
Our Sunday Visitor
Pauline Books and Media
Priory Press Dominican Series
RCL-Benziger
Sadlier
St. Mary's Press

Periodicals:
Catechetical Leader
Catechist
Faith and Family
Lay Witness
Religion Teacher's Journal
The Sower

Links:
Vatican's Holy See
USCCB (US Bishops)
Catechism of Catholic Church online
New American Bible online

Organizations:
Association for Catechumenal Ministry (ACM)
National Conference for Catechetical Leadership (NCCL)
National Catholic Educational Association (NCEA)
National Federation for Catholic Youth Ministry (NFCY)