It's important to know about the company you're going to interview with. The internet is a wealth of knowledge if you decide to use it to your advantage. Most companies have their own website and it's a good idea to understand what they're all about. Find out how long they've been in business and what is currently being practiced. Reading your potential employer's blog is an excellent way to stay on top of what the company is going through and what it practices on a day to day basis.
Make a list of your strengths and weaknesses prior to attending an interview. You're likely to be asked about both. Don't be too hard on yourself but at the same time, don't brag too much either. You'll want to find a fine middle ground that you'll be comfortable with.
Toward the end of an interview, the interviewer is likely to ask you if you have any questions. It's best to come up with something simple that he or she did not cover. This isn't the time to show off or to complain.
No job is complete until the interviewer asks why you have left your last job. Don't use this time to point the finger and blame anyone at your former employer's office. You don't want to go on and on about how much you hated the mundane tasks are your former job. All jobs come with a job description and you're bound to dislike a handful of the tasks. No job comes with a list of things everyone will be happy with. So keep your answer simple and to the point.
Following up with the interviewer can be a sticky situation. It's a good idea to send an email thanking them for their time. This is a good time to ask any lingering questions you may have forgotten to ask during the interview.
These are just a few tips to take into consideration when heading over to your interview.