As a scholar of religion with a particular interest in Judas, this was for me a particularly interesting examination of the relationship between Judas and Jesus. The text is referred to as early as the 2nd (I think) century C.E. by St. Iraneaus who writes of a Gospel of Judas in 'Against the Heresies,' but didn't surface again for nearly 2000 years. For apologists like myself who feel that Judas has drawn the short straw throughout the course of history, 'The Gospel of Judas' is a fascinating rendition of Judas that shows a wholly different, more sympathetic Judas from the one modern Christianity knows.
This is not, however, a text that should be read for anyone who is spiritually married to the Bible as it exists. A friend of mine who is highly religious and highly tied to Biblical text as, well, gospel truth, called it "sacrilege."
Redacted in the 2nd century AD, this edition a little later.