Library writers: how do you keep it organized?

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This is a question for you established library music guys... Since I'm committing to really dive into it this coming year, I want to put the right infrastructure in place as I get rolling. So...How do you catalog and keep track of all the pieces in your library? Things like: genre, style, classification, tempo, key, co-writers (and their percentage) where you've pitched them, what libraries have them, what's exclusive or not, etc. And then how do you keep the actual Audio Files themselves? By date? By Style? Just thrown in one big folder? Do you assign a "number" or just name them? It smells like a custom database to me, which I haven't created in years... and maybe iTunes is enough for the Audio Files... hmmm. So, how do you do it?