1. Be on time 
There is no excuse for it, none! You don’t want a pissed off person interviewing you. Leave your place early. Do whatever it takes. Blaming traffic or anything else doesn’t matter (even if it’s true).

2. Cell phone off 
Obvious yet easily forgotten. Double and triple check to make sure your cell phone ringer is turned off.

3. Know the company, and why you want to work there 
Google the company you’re interviewing for. Learn as much as you can about the company’s mission, objectives, goals, and future plans. If you’re asked why you want to work for the company, your answer should be more constructive than merely, “I like the company’s location”.

4. Dress in a clean conservative manner 
Make sure you go into a job interview having showered and wear clean fitting clothes! Tone down on your cologne and perfume. What’s pleasant for you may be overwhelming to your interviewer.

5. Profiles to private
If you don’t think interviewers Google you or look you up on Facebook or MySpace, you’re crazy. Hiring managers I’ve talked to all do their fair share of sleuthing. As one puts it, “to weed out people who wouldn’t be a good fit in the company’s culture.” Do yourself a favour, set your profile to private.

6. Don’t badmouth a boss 
Bad mouthing a previous boss in a job interview is a huge negative. They may have been the worst boss in the world but expressing that in a job interview is a huge mistake.

7. Have good eye contact 
Staring at the floor, ceiling, or wall when speaking or listening makes you appear disinterested. Again, simple and obvious but it happens way more then you’d think.

8. Have goals 
Maybe you don’t have any idea where you want to be in a few years professionally but please figure out something to say. If you don’t have a goal when you’re asked, you appear un-ambitious, leading an interviewer to think you’d be a lazy employee.

9. Be passionate
Express why you want to work in that field/industry and what you have done to further your own knowledge (books, blogs you read). The more intelligent or informed you are, the more impressive you’ll look.

10. Ask Questions
At the end of the job interview make sure you have some questions to ask. If the interviewer doesn’t offer you a chance, ask to ask. Again, it reinforces your strong interest in the job.