Gospel of Judas

National Geographic has a thorough website about the recently published Gospel of Judas. The site offers the complete Coptic text, an English translation, and a 14-minute webcast of a press announcement about the discovery, conservation, and context of the manuscript (including a very brief contribution from Gnostic scholar Elaine Pagels). There's plenty to be found on the web about the Gospel itself (1)(2)(3), gnosticism, etc.

The library will set about ordering both Geographic's primary scholarly publication, and some books about the gospel and its historical context. We do have a number of older books about the Gnostics, but for the current topic you are better off using the web until some current books are available.