University of Toronto (Canada)
University of Toronto: Five Gospel Parallels
Unbelievable site which has all five gospels on the page at one time so you can do a text by text comparison. Very interesting and helpful.
PBS
Pbs Frontline: The Gospel of Thomas
The complete text of the gospel which includes over 100 sayings of Jesus as taken down by Didymos Judas Thomas.
PBS
Pbs Frontline: Q and the Gospel of Thomas
An intriguing article that discusses the the possibility that there was another unknown Gospel and the finding of the Gospel of Thomas which was a collection of sayings by Jesus.
PBS
Pbs: The Gnostic Gospels
A detailed account on the finding of the Gospel of Thomas plus a nice survey of what the Gospel contains.