Jeff Meyers has posted some audio files over at his blog that are well worth investing some listening time in. These audio lectures are taken from the The Colloquium on the Sacraments held at the 38th General Assembly of the PCA. I have included the links to the audio files (all zipped for easy downloading) below as well as a link to the papers for each presentation:

Title: What Do The Sacraments Actually Accomplish In Their Administration?

Will Barker's Presentation on the Reformation and puritan background (7.1mb mp3 file)

Rob Rayburn's presentation (6.7mb mp3 file).

Ligon Duncan's presentation (6.1mb mp3 file)

Jeff Meyers's presenation (7.9mb mp3 file).

Responses from each speaker and Q & A session.

Lecture papaers