Aks HN: What testing regimes do you consider most important?

In http://news.ycombinator.com/item?id=866707 on "TDD Derangement Syndrome (objectmentor.com)" I commented that: "It would also be useful if people would be more explicit and specific about the techniques they are actually discussing. Consider, for example, the earlier comments about confusing or conflating TDD and unit testing." So what papers or other sources do you think are most fundamental or defining for whatever testing programs or regimes you consider important?