Do Psalms Carry Enough Weight?

Today in Sunday School we discussed the Psalms and how specifically the Psalms of Lamentation (like 137) are sometimes specific to situations and therefore do not apply to us at all times. But we also learned the Psalms were a powerful vehicle for corporate worship, and we talked about what issues we personally have with admitting our inner most struggles to God in a private setting. Could we use the Psalms more often to help us in our Christian walk, and could we use each other more for accountability? Are there actually parallels here between the Psalms and corporate accountibility, or have I just made something up? - Stephen