I collected these "Rules" from the Forum back in the summer:
Ten Rules for Cooking in Cast Iron
1. Preheat your iron slowly.
2. Know what temp range you want to cook in before starting. Low, moderate or hot.
3. Have patience.
4. Don’t skimp on the oil or butter.
5. If you’re lookin’, you ain’t cookin’.
6. Once the food gets warm, you can turn the heat down a bit unless browning.
7. Above medium heat takes a special reason.
8. Do not fry bacon or eggs topless.
9. Don’t walk away unless you KNOW what the situation will look like upon your return.
10. Slide food sideways before turning.
I'll add +1 to the comments about preheating to avoid thermal shock with thin iron.
Enjoy!
Steve