IEP and SEP have entries on Aristotle's biology

SEP (by James Lennox)
IEP

John Rao, Is the Pope Greek?

a history of Greek influences on the Church of Rome

Check out his Catholic Social Thought: Europe (An entry for Catholic Social Thought, Social Science, and Social Policy (Scarecrow Press), to be published, 2006)

Dr. Chojnowski's articles

someone's posting them at this blog

Dr. Dennis McInerny's books

are available through Fraternity Publications

The Philosophy of Nature
Philosophical Psychology
A Course in Thomistic Ethics
Metaphysics
Natural Theology
Being Logical