The Heart of Prajna Paramita Sutra - Translation by the Buddhist Text Translation Society - http://www.fodian.net/English/The%20Heart%20of%20Prajna%20Paramita%20Sutra.htm
Heart Sutra - Two different versions. - http://www.digitalzendo.com/?library&step=6
Zen Dynamics Heart Sutra page - The Heart Sutra in Japanese with a word-by word English translation and commentary - http://www.andrew-may.com/zendynamics/heart.htm
Hannya Shingyo - Translated by the Stanford Zen Translation Project. Text is annotated for instrumentation during services. - http://www.stanford.edu/group/scbs/sztp3/translations/gongyo_seiten/translations/part_1/hannya_shingyo.html
The Heart Sutra - An interpretation of the Heart Sutra by George Boeree, Ph.D., to make the sutra clearer for college students. - http://www.ship.edu/~cgboeree/heartsutra.html