I am still messing around with audio lectures and PowerPoint, here is one I just completed for a New Testament Theology class at the seminary where I teach, so keep that in mind. In other words, there are significant critical issues with which I am aware but are not dealt with in this presentation. Sorry. The presentation is about 30 mins. long.
The original framework and powerpoint presentation built on the work of Brenda Colijn. Here is my bibliography for those that are interested in further study.
Blomberg, Craig. 1990. Interpreting the parables. Downers Grove, Ill: InterVarsity Press.
Campbell, William S. 2006. Paul and the creation of Christian identity. Library of New Testament studies, v. 322. London: T & T Clark.
Dodd, Charles H. 1936. The parables of the Kingdom. Welwyn: Nisbet.
Fitzmyer, Joseph A. 1985. The Gospel according to Luke (X-XXIV): introduction, translation, and notes. New York: Doubleday.
Getty-Sullivan, Mary Ann. 2007. Parables of the kingdom: Jesus and the use of parables in the synoptic tradition. Collegeville, Minn: Liturgical Press.
Ladd, George Eldon. 1993. A theology of the New Testament. Grand Rapids, Mich: Eerdmans.
Longenecker, Richard N. 2000. The challenge of Jesus' parables. McMaster New Testament studies. Grand Rapids, Mich: W.B. Eerdmans Pub. Co.
Marshall, I. Howard. 1978. The Gospel of Luke: a commentary on the Greek text. Grand Rapids: Eerdmans.
Snodgrass, Klyne. 2008. Stories with intent: a comprehensive guide to the parables of Jesus. Grand Rapids, Mich: William B. Eerdmans Pub. Co.
Witherington, Ben. 1994. Jesus the sage: the pilgrimage of wisdom. Minneapolis: Fortress Press.
Wright, N. T. 1996. Jesus and the victory of God. Minneapolis: Fortress Press.