In todays job market you must be competitive. Think shock and awe don't be afraid to be a LITTLE cocky. Don't be conceaded be convinced. Always dress a step above what you are applying for. Use the power of the internet to find out as much as you can about who you are applying to. Not just the company but the person conducting the interview and the person making the hiring decision. You have one objective to get a 2nd interview and be SURE to send a thank you note.