Jon Preston asked : " What are the accuracies or validity of these? Are there any that are more valid than the others? That can be traced back to similar dates as both the old and new testies (hehe)"
Most of those listed in the latter part of jgnats list are younger than the N.T. Easy to check 'em out on Wiki.
As to accuracies or validity, no text has those qualities 100%, especially the Canonical New Testies as you call it Jon.
What is interesting is to see where the canonical books directly quote quote from these texts, or rely upon them. This is almost denied by the W.T, but as with most everything, they are wrong. The problem with admitting that the texts are used by writers of the N.T is that the use seems to infer that the texts are "inspired" too, something the WT would hate, as much of what is in there is at odds with their teaching.
They get round this by claiming that the N.T writers were inspired to use the phrases etc that they did, but that does not make the rest of the work they plagiarised "inspired" nor canonical.
Only the books chosen by the Roman Catholic Church in the late fourth Century are acceptable to the W.T
If you have the time, a study of all of these is fun and rewarding.
A most interesting text that has not been mentioned I think, and is possibly a very early one is the Didache. Worth a look.