Hopko, Thomas. The Word of the Cross [audio]. Crestwood, NY: St. Vladimir's Seminary Press.
This set of two tapes can be purchased by calling 914 961 8313 and asking for the bookstore. A dying woman called these tapes her "novitiate," Perhaps the best of Father Hopko in summary version.
Ware, Kallistos. The Power of the Name : The Jesus Prayer in Orthodox Spirituality. New ed ed, Fairacres Publication ; 43. Oxford: SLG, 1986.
This is a thin, mint-green booklet which is excellent for beginners, or elders on the topic of prayer.
Ware, Kallistos. The Orthodox Way. Rev. ed. Crestwood, NY: St. Vladimir's Seminary Press, 1995.
This somewhat comprehensive approach to the spiritual journey provides a readable and delightful way to understand the basics of Orthodoxy.