This article (albeit, probably 3 pages too long) is a fairly good assessment of the relationship that exists between Aufidius and Coriolanus. I particularly enjoyed Hunt's discussion of Coriolanus' death, and what this means for his character. Hunt cites him as a stereotypical Roman who "cannot admit the softer feelings stereotypically projuected onto boys and women." I think this is an important point about Coriolanus' character. He lives in this world of war and of blood which defines him so completely that he cannot look past Aufidius' insinuation that he is a child. That having been said, this is a character who just gave in to his mother, despite being so terribly resolute in seeking his revenge upon Rome. I also enjoyed the implication that, once Coriolanus was dead, Aufidius had exorcised his demons and was free to mourn his fallen sort-of comrade.
I was also a huge fan of the parallels that Hunt draws between Othello and Coriolanus. When I first heard him begin to make the comparison, I thought it was a stretch, but Hunt managed to convince me. Their relationships are surprisingly similar, forged in battlee, but i tend to think of Iago as being much more in the vein of Aaron, than Aufidius. He's so much more conniving and sinister than Aufidius, who seems to (at his worst) simply have an enemy-of-my-enemy relationship with Coriolanus. Iago is motivated by disgust over Desdimona's choice of Othello, his anger is much more base, and nowhere near as political motivated.