While the questions in this article appear biased towards a 60/40 work/life balance, I would say they're spot on in detecting a very specific cultural fit. If nothing else, these questions would get a candidate talking. They're a little on the aggressive side for my interviewing style, but I imagine they're quite effective.
Keep in mind, the job candidate should also be interviewing the company. If someone were to ask me what unpaid work I have done in the past, I would consider the cultural ramifications of the question. In this case, I would need to be okay with an aggressive internal culture.
Come to think of it, it's important to realize that when you interview candidates you may very well be the first impression of the company. Articles like these offer a glance of a company/interviewer without having to go through the trouble of applying.
I would really like to find a way to study the effectiveness of interviewing styles. I wonder what metrics would even apply?