On July 7, 2007, Pope Benedict XVI issued the Apostolic Letter motu proprio Summorum Pontificum, which permits priests to celebrate the Tridentine Rite of Holy Mass (Roman Missal of 1962 - the last edition of the Tridentine Mass issued before Vatican II) without obtaining special permission from a Bishop.
The pope also made it much easier for lay people to attend such a Mass if they wish. The motu proprio itself was issued in Latin; the text can be found here. Although there is no official translation into English or any other language, an English translation is available which has been published in the Newsletter of the Bishop's Committee on the Liturgy of the United States Conference of Catholic Bishops.
The motu proprio is accompanied by a letter from the pope to the Catholic Bishops of the world. This was issued in six vernacular languages, but not in Latin. The English text can be found here. For other languages, go to the Vatican web site.
