I hate typical industry interviews because they are sham promotions for manufacturers or proxies set up by the manufacturer's marketing people (though the worst are clearly Security Stock Watch).
That said, I do think interviews, done right, can help expose useful information that rarely gets publicized. For instance, the Retail Surveillance Operator report was extremely well received. Additionally, the Chiefs of Police one and the Video Forensics expert one both had real insights.
My preference is for people in the trenches - security guards, managers, contracting officers, maybe installer, sales people, etc. Unlike corporate executives who speak in sound bites, 'regular' people tend to be willing to speak frankly good and bad.
I also think it could be useful to interview manufacturers but only anonymously so the interviewee does not feel the pressure to spout the party line.
Is there any type of person or specific individual you would like to see interviewed?