His most well-known book is Panarion which means "Medicine-chest" (also known as Adversus Haereses), a handbook for dealing with heretics, listing 80 heretical doctrines, some of which are not described in any other surviving documents from the time. This book was only recently (1987) translated into English.
Printed Editions
The Panarion of Epiphanius of Salamis, Book 1 ISBN 9004079262
External Links
Some excerpts from Panarion (http://www.tertullian.org/rpearse/epiphanius.html)
More excerpts (http://essenes.crosswinds.net/panarion.htm)
Epiphanius, (Epiphanios), bishop of Constantia and metropolitan of Cyprus, was born at Bezanduca, a small town in Palestine, in the district of Eleutheropolis, in the first part of the fourth century.
Epiphanius died on board the ship, which was conveying him back to Cyprus, A. 402, leaving us a melancholy example of the unchristian excesses into which bigotry may hurry a man of real piety, and a sincere desire to do God service.
Of Constantia and metropolitan of Cyprus, distinguished from the preceding as the Younger, was represented at the third council of Constantinople (the sixth general council) by the bishop of Trimithus, one of his suffragans.