The United States Conference of Catholic Bishops Committee on Evangelization and Catechesis approved for Catechetical Sunday 2010 the theme "Matrimony: Sacrament of Enduring Love" to coincide with the release of the Bishops' Pastoral on Marriage.
Catechetical Sunday will be celebrated on September 19, 2010.
Some of the resources are already available (at no charge) online at www.usccb.org/catecheticalsunday/resources.shtml.
Included are lesson plans, teaching aids, resources for catechetical leaders and families, prayers, and various articles for pastors, etc.
The National Conference for Catechetical Leadership has also developed some resouces - a reflection booklet on the Sunday readings, designed for catechists and parents and a pin with a silver cross with a gold heart laid upon the cross. Check them out at http://www.nccl.org/.