- Read up on the company you're interviewing at. What do they do? What's their pride and joy? When appropriate in the interview, make references to these things. Show interest in the company and what it does, not simply an interest in a job.
- If you're interviewing for a programmer position and you've not written C/C++ or Java (or whatever your claimed #1 language is) for a while, take the time to brush up. You want to be confident when you put pen to whiteboard in the interview to answer a coding question.
It's the little things in an interview that will make all the difference.