Each month, Pope Benedict XVI announces his special prayer intentions—particular things that he wishes all Catholics to pray for that month. (When, for instance, we pray the rosary and say the prayers at the end for the intentions of the Holy Father, these are the intentions for which we're praying.)
Pope Benedict offers two prayer intentions each month, one general, and one for a particular Catholic missionary activity. The Holy Father's prayer intentions for June 2012 are particularly interesting, because they remind us that evangelization is not merely a one-time activity. Proclaiming the Gospel, living the Faith, and believing in the truths that the Catholic Church teaches are the work of a lifetime.
You can read Pope Benedict's prayer intentions for June 2012, and find some appropriate prayers to join your intentions to his.