Good Friday traditionally marks the beginning of a novena using these prayers, each of the nine days focusing on a specific intention as mentioned in the writings of Sr. Maria Faustina. This year's novena takes on more significance as its promoter, Blessed Pope John Paul II will be canonized on Divine Mercy Sunday, along with Blessed Pope John XXIII.
Full details about this devotion may be found here.
Blessed are they who show mercy. May mercy be shown to those who ask for it as well.