Yeah, I have to agree with eveyone...make certain someone with spell check did your resume. And if they make you fill out a standard job application while you wait for your actual interview...carefully spell everything!
Other than that it all comes down to PRESENTATIONPRESENTATIONPRESENTATION!!!
I'm not certain what type of job you're going after but if it's white collar make certain your suit is pressed, your tie is right on, your hair doesn't need a trimming (nuff said on that subject

), nails are cut, beard (if you have one) is trimmed, etc...You could be the most qualified person for the job but if your appearance is "off" that might queer the deal.
Project self confidence and look the interviewer IN THE EYE when you two are talking. Eye contact...very important.
Good luck amigo!