My personal favorite is Stepping Up: A Journey Through The Psalms of Ascent. Beth explores the major feasts of Israel and the songs of these traveling pilgrims on their way to these festivals. In the homework, she asks us to write our own Psalms (songs) to God based on themes each week. I did this study during a very tumultuous time in life, and spent many days in prayer and petition as I worked through difficult circumstances.
So tell us your favorite and why. 1, 2, 3, go!
And, if you want more information about Stepping Up, check it out here!