iBreviary apparently brings a complete missal, with options for Spanish, French, English, Latin and Italian. It has been officially approved by the Vatican and can be down loaded through itunes! Can the traditional version be far behind....
Today's O antiphon is from Cantuale Antonianum:
O Key of David and sceptre of the House of Israel;
you open and no one can shut;
you shut and no one can open:
Come and lead the prisoners from the prison house,
those who dwell in darkness and the shadow of death.