This is the best article on the Judas issue I have read. This "gospel" is very interesting for our understanding of 2nd century gnosticism but is irrelevant for our understanding of Jesus and his relationship with Judas. If you would like to download and english translation click here.
The Gospel of Judas is a portion of a centuries-old codex (book) written in Coptic (an ancient Egyptian language). Included in this codex are other documents known to be Gnostic. This suggests that the contents of the Gospel of Judas may well be Gnostic, an assumption confirmed by the evidence of the text.
The Gospel of Judas does not claim to be a firsthand account by Judas. He is not the narrator, but a chief participant, along with Jesus. The other disciples appear in this gospel. That are insignificant and in fact condemned by Jesus Himself.
The Gospel of Judas, in an earlier form than we have it now, was known among second-century orthodox Christians. Irenaeus of Lyons, who wrote an influential refutation of what he considered to be heretical Christian ideas, said this in Against Heresies. Read the Whole Thing.
Update: Found another good article here.