QA
In 1991, during the Gulf war, American Patriot missile was deployed to combat Iraqi scud missile.
I was reviewing the Apache JMeter book by PACKT publishing (nice book, will publish the full review soon) and came across a common misunderstanding in software testers about test automation.
These add-ons are so useful that I cannot work for a single day without them and so I would suspect most web developers and QA Engineers.