Two years ago, my writers' group embarked on a big task: we wanted to put together a monthly devotional on the Book of Psalms. And just before Christmas, our efforts resulted in a book that we can hold in our hands:
As noted by the title, the devotional covers thirty-one days and can be used repeatedly throughout the year. Each devotional ends with an application portion, which will hopefully challenge you to apply the Psalm to your life.
If you are interested in purchasing a copy, here's a link that will enable you to do that.