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Digging stuff up in the Lexicanum, I ran across the Exorcists-composed Chapter (http://wh40k.lexicanum.com/wiki/Exorcists)...and don't really recall them besides some of the early editions. Are they still part of canon or, like Malice the fourth Chaos god and Warhammer fantasy connections, have they been long abandoned?

Also...666 verses from the...Book of Exorcisms?
This one I really did not know. Where does it come from? Official manuals? Books? I had never even heard of it before...

Look at the list of sources at the bottom of that link.
One main place for more info would be "Chapters of the Badab War - Part Two", as mentioned there.

They still exist, and are in some of the FW publications. They've suffered from bad fluff writers, however.

beast_gts wrote:
They still exist, and are in some of the FW publications. They've suffered from bad fluff writers, however.

How bad?
Multilaser-level bad?

There is an Exorcist in Steve Parker's Deathwatch