I know I mentioned sterilizing the loop between quadrants, but its really not necessary. I mentioned it because most people not familiar with the techniques tend to take up an entire colony and streak it, which isn't needed. If you only take a very small amount, you don't have to flame your loop between quadrants to get isolated colonies.
Here are the two main streaks I do. I like to make a big third "quadrant" (I guess its not really a quadrant if I only do three sections...).