The Legacy if i've left anything out pls jump in and include what you remember.First of let's make it clear that Pope Benedict the XVI is NOT the successor of JPII-JPIi was his predecessor but any Pope is the succesor of Peter and not the Pope prior to him.
Ok.Now let's take a look at the legacy of our late Holy Father.
The first thing that always comes to my mind is the Luminous mysteries added to the rosary-completing the gospel.
The Catechism!!!
Ushering in the implimentation,properly understood,of Vatican II.In spite of the abuses(which,imho,would have happened anyway.Vat II ws an excuse).
World Youth Day
Bringing the Papacy to the People and showing by example how to live,suffer and die in Christ.
Reverance for the Eucharist
The Two great jubilee years.The year of the Rosary (Mary)and the year of the Eucharist.The two great pillars of our Catholic faith.(read St.John Bosco's dream sometime if you haven't read it already).
His great encyclicals,poems,writings and exhortations and compilation of his addresses on family and marriage-Theology of the Body.
The phrase culture of life encompassing JPII's and the Church's staunch defense of the right to life from conception to natural death.
Spread of the devotion to the Divine Mercy throughout the Church including his declaration of Divine Mercy Sunday.