Causality Good stuff, SX. I am, overall, suspicious of much discussion about causation held over the past few hundred years because it seems to take for granted that everything reduces to efficient cause in the final analysis, which is just not true. I strongly suspect that this is the root of goofy reductionist theories that claim that causation only happens between fundamental particles or whatever - a dogmatic reduction of every instance of causation to efficient cause.
In regards to the last remark quoted from Oyama, I think that a good analysis of causation in a system depends on two things. First, you need a good "nose" for the level of invariance in the relevant background conditions - that is, when you use a ceteris paribus, you have to have a good estimate of how likely it is that everything else really will be held the same. Second, you have to be sensitive to scope. Anything that posits an effect on a particular scale has to take into account causes/conditions on that scale. If I claim that a riot in a small town will spread across a nation, I have to take into account conditions in the rest of the nation, for example.
One place where this really irks me is getting causation backward and, more importantly, confusing one's mode of knowing with the thing known. There is a difference between knowing that there is fire because you see smoke and assuming that smoke causes fire (or, indeed, that fire causes smoke). The post hoc ergo propter hoc is a more insidious and subtle fallacy than you might think - it's not just about people taking statistics the wrong way.
For an example of how it can be insidious (that relates to our discussion of causality), consider this statement: "Every time I've seen A, I also see B." Some smartass tells you that this is just "anecdotal evidence." The correct reply (which people always seem to miss) is this: "What are the odds that I would always see A and B together if one did not cause the other?" That is how you know when a anecdote comprises a data point, I think.
(Sorry if this is all a little vague - I am somewhat sleep-deprived right now)