Unit testing is a vital but neglected art. Good unit tests don't just test code: they are executable requirements that tell the story of your application, clarify your design, document your code and help track your progress. They help you find bugs fast, and fix them with confidence. If Real programmers don't need unit tests, they sure make life easier for the rest of us!
Clipping is a handy way to collect important slides you want to go back to later.