I won't post any questions, there are tons of those, easily found on the web. I just want to stress the importance of one or two *serious* technical questions where the interviewee is required to (1) think and (2) write code.

I've seen quite a few people with glittering resumes and good presentational skills (i.e. they look/sound great on paper and in describing themselves), but who are hopelessly incompetent in writing code. People with "5 years of high-level super-complex C development" don't remember trivial things like pointer arithmetic and the idioms of memory allocation. Others were good in solving a question algorithmically, but when faced with a paper'n'pen couldn't produce anything coherent.

Therefore, I feel that technical questions are very important. An interviewee simply MUST write code. It may be small code, but he must write it. Even trivial stuff like (important especially in Perl) - read every line in a file and find how many times "BUBBA" appears in it, is important.