Hey Obiwan,
Well, I guess I'll bite (though if this turns controversial, be warned I don't have time over the next few days to come defend anything, so it's not because I'm backing down. :-P).
Anyway, to your question. Some of this will be repetition of what went before. Let's say I do well on a test. It's true that I probably worked hard and studied, and have natural abilities. But it's also true that I believe God works in every detail of history, including my own birth and attributes, my ability and focus to work hard and study for the test, my being at school to take the test, the fact that I got into that course and not another (where maybe the test would have been unreasonable), the things that didn't go wrong that would have distracted me from studying for the test, etc., etc., etc. He ultimately decided that I would do well on the test (in the context, obviously, of a vast web of historical, present, and future events that I cannot fathom).
As for why He would care: well, omniscient beings can care about a lot of things all at once, and He has explicitly said that He cares about the small, and about details of our lives, so that is why I would think that. As Eden implied, albeit sarcastically, our normal scales of mundane and important don't make much sense to Someone who can hold it all in His mind at once. Of course some things might be more important than others -- they clearly are -- but they're all important at some level, and it's not like He has to prioritize.
I hope this helped. I've thought about this stuff a great deal myself.