Prayers to the Blessed Virgin Mary Eucharistic Prayers Prayers to God, the Father Prayers to God, the Son Prayers to God, the Holy Spirit Miscellaneous Prayers Prayers Invoking the Intercession of Dominican Saints
  Other useful sources for biographies and/or prayers:

http://www.catholic-forum.com/saints/index012.htm

http://opthird.com/opthirdlinks.htm