The PC(USA) provides a weekly podcast of the lectionary readings read aloud in their Devotions & Readings area.

Subscribe with iTunes here, and with a any other device/tool here.

Each podcast includes four lectionary readings for one of the Sundays or festivals of the church year:  an Old Testament reading, a Psalm, an Epistle and a Gospel reading. Following each set of readings is a prayer for the day from the Book of Common Worship. May these scriptures be a source of challenge and hope as you prepare your heart and mind for Sunday worship, and may the Word of God guide and nourish you in the service of daily living.  (From the PC(USA) website)

Additional PC(USA) lectionary tools can be found here.  Happy Listening!