1) Steve Steel over at “Shall we Sing a Song for you” is providing these excellent lectures by Edward Donnelly originally found HERE.
Edward Donnelly – The Christian and the Psalter (Adult Conference 2005)
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2) Check out Anthony Selvaggio‘s series on Psalmody at Sermon Audio:
The Arguments Against Exclusive Psalmody
The Argument for Exclusive Psalmody
Six Commandments for Psalm Singers: A Manifesto for Psalm Singers
The Power of Congregational Singing
Bonus : Why We Worship Without Musical Instruments
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3) For your listening pleasure and soul’s edification check out the Psalter page of First RPC of Cambridge, MA
Endeavoring Progress 