1) When entering a corner and throughout, look at where you want to go. The body is a much more integral part of the motorcycle than driving a car, object fixation (such as looking at a barrier on the outside of the corner) can really fuck things up if you lose concentration.
2) When leaning right, a tiny bit of pressure on the right bar will help the bike tip in more easily. Vice/versa for left turns.
3) Wear leathers all the time. I hit the road at 20mph without leathers back when I was 17......it fucking hurts!
4) Always let people know what you're doing. Don't muck about hiding in peoples blind spots, just be assertive. But don't forget, everyone else is out to kill you.
5) I recorded myself recently to see how my body position looked, just to see if I could improve. I don't think this is too bad an example of how to ride 'spiritedly'!