Fahim Sachedina explains how to do Agile testing right and lists out metrics that can help you measure the effectiveness of your tests.
Additionally, James Lyndsay came up with plenty of Questions about Metrics that may come in handy when evaluating them.
Blake Norrish emphasises why software testability is such an important thing, describes how it relates to testing, and advises on what we can do better.
Bugs are part of the software. Steven Bui shares useful tips on how to investigate, prioritize and fix their root cause.