Logia: A Journal of Lutheran Theology has a 7-lecture collection on catechesis. They provide this audio collection either as 7 Mp3 files on CD, or as an Mp3 download.
The collection includes:
If I Had a Hammer-Introduction to Luther’s 95 Theses
Michael Albrecht
Catechetics and the Royal Priesthood
Peter Bender
The Parent: Chief Catechist of the Royal Priesthood
Peter Bender
Confession
Kenneth Korby
5 1/2 Sermons on Catechesis
Kenneth Korby
Liturgy and Catechesis
John T. Pless
The Catechism: Handbook for the Royal Priesthood
John T. Pless
Running time is 8 hours, 11 minutes. Price is $15.00.