Here are a couple links that dive in to the super metrics and finer points of the dashboards. They give EXAMPLES of ways to use them in different scenarios.
posted two good docs on deep diving in to the super metrics and explaining how to use them:
Gregg Parsons did a super metrics white paper, it was written for 1.0 but still generally valid for 5.* versions
While these may not cover every single widget, I'm sure these will help you!