Psalms of Lament (or should we call them "petitions"?)

Tyler over at his Codex blog has another neat post on the psalms, this time on the laments. He takes up the question of what we should really term these psalms. For example, would they be better named Complaints, Prayers, Pleas, or, Tyler's current choice, "Petitions." Click here to take a look, and perhaps leave a comment with your own vote. Meanwhile, here is another teaching slide, this one focused on the Sitz-im-Leben of the individual "lament" (click to enlarge):