Pretty simple and pretty good.
Add other spices (rub, garlic, citrus, etc.) as you see fit.
It all depends on what sort of flavor profile you're going for.
I saw a Greek marinade on TV that sounded great (citrus, olive oil, garlic and herbs...thin it a bit with water or wine).
Another source of ideas is with those envelopes you see at the grocery store (seems I've seen several marinades for chicken that might be worth a try).
You probably want more precise recipe, but I've always simply thrown stuff together until it tasted the way I wanted and have good results doing that.