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I saw this article http://www.ncbi.nlm.nih.gov/pubmed/16710314 and it mentioned pA(2) values and I had no idea what they were. What are they? What do they mean?

If possible it'd be just dandy if you could cite some journal articles/books/other reliable sources for me to dig up.

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I don't know enough about this to write a good answer, but you can find an explanation here. A p(A2) value describes the affinity of an antagonist for its receptor. –  Alan Boyd Jun 27 '13 at 16:21
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up vote 1 down vote accepted

Digging around a bit, I found a few resources:

Design and models for estimating antagonist potency (pA2, Kd and IC50) following the detection of antagonism observed in the presence of intrinsic activity.

and PHARMACODINAMIC on page 30, describes pA2 as:

indicates affinity of antagonist for receptors

(as Alan Boyd just commented on)

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