Excellent article and thread

My 2p - in interviews I deliberately ask one or two questions nobody in their sane mind outght to know the answer to immediately - the most valuable answer you can get from an interviewee is 'You know, I just don't know the answer to that question. I could guess, but I'd much rather look it up in BOL, MSDN, etc'. I want to know that an prospective employee/colleague can admit to not knowing everything (let's face it, nobody can know everything about computing these days, not by a long straw), and more importantly, they know how to find the authoritative answer!

Of course, cultural fit is crucial, knowing you can work with somebody and that you can trust them to get on with the job is more of a gut feel thing, however technical questions are really useful interview tools