Heart Sutra
This Mahayana school Sutra, is often said to be the most popular Sutra. The full name for the Sutra is The Heart of the Perfection of the Transcendent Wisdom.
http://en.wikipedia.org/wiki/Heart_Sutra
http://www.buddhanet.net/e-learning/heartstr.htm
This will conclude for now my listing of important Sutras. Beginning Monday I will start to examine each in more detail.