It's such a shame, the historical significance of the older and more numerous biblical books speaks a great deal about previous beliefs that lead to the modern incarnation(s). If I were still religious, I'd be diving into this thing head first. I know Levite is certainly interested in the roots of his faith.
Religion is a hard thing to pin down because the believers are so varied.
Anyway, here's a good translation of the Shepherd of Hermas:
The Shepherd of Hermas (Lightfoot translation)
And the Epistle of Barnabas:
The Epistle of Barnabas (translation J.B. Lightfoot)