We studied the Psalms in our 20s & 30s class a few months ago. In doing so, we made an attempt to not just talk about the psalms but to allow the voice of the psalms to speak into the class itself. We wanted to hear what they say and then reflect on them rather than get caught up into all kinds of lecture on poetic tools, authorship, and all of that (all good topics for study of course!). I also just uploaded this in the Bible Class Archive. This study put the free material in there over 3000 pages!
Here is the pdf of that study we called Psalms In Real Life