Timothy Kauffman has a series entitled "The Visible Apostolicity of the Invisibly Shepherded Church" ( a series of 8 articles)
I have read Part 5 which deals with Irenaeus and the Roman Catholic claims of Papal authority.
It is very good. I learned a lot of new valuable information about Irenaeus and church history.
I also read Part 1, which is very good also. Tim has done a lot of work and provided a lot of great information at his web-site/blog. I wish I had time to fully digest more of it.
I encourage everyone to check out his material on this 8 part series and the one below.
See the links to each of the 8 articles at Apologetics and Agape.
This is also very good in dealing with Mary and the lack of any evidence in the early Patristic sources on Mary's sinlessness or Immaculate conception.