So it was just a single interview?
You know that's one of my questions about the job interviews. Will there be multiple interviews and how soon do they expect the position to be filled by? Plus how long has the job been vacant or is it a new position created.
Plus if you really want the job. You should follow up with a thank you call for the interview and remind them how much you really want the job. Sometimes a follow up thank you letter to the interviewer. Send it one day after the interview.