I've been on both sides of the desk in the electronics industry..
If you have the job of interviewing candidates you should remember that your company is also "on parade"...
I once arrived in a waiting area to find other job applicants discussing the company (which made helicopters) in very unfavourable terms. The group included three or four people that had already been in for their interview and who found it hard to stop laughing. It seems the interviewer was really dire and everyone had quickly made up their mind that the company was probably also a dire place to work. Most of us only stayed to get our travelling expenses. When it came to my turn he had another applicants details in front of him. I declined their offer of a second interview some weeks later.
Later in my career I was on the other side of the desk. To be honest I'm not sure which side is harder.
Tips for candidates:
Read up on the company. A common question is: When did you last see a news story about us and what did you think about it? If they don't ask it then you can say... "I was reading that you recently did xyz, can you tell me a bit more..." It shows interest.
Go prepared with questions to ask. I've been to an interview where the interviewer had done no preperation - he just sat there, asked almost no questions, and the silence was deafening.
A good question to ask the interviewer is: "Why do you work for xyz". I don't recommend asking "Why should I work for the xyz" unless you know they really really want you.
Watch out for totally off the wall questions: Like.. "What would you do if you found a dead swan in the road? (Yes someone really asked me that). They don't usually care if you give the wrong answer, it's the way you answer that counts. If you don't know the answer say so but tell them how you would go about finding out the answer. Oh and I believe dead swans should be reported to the police - something about them all belonging to the queen I think?
PS; Watch out for group waiting rooms. It's a good place to find out if your applicant mixes well. Make an effort to talk to other people but note that they may not all be applicants, some might turn out to be staff.