Check that your recent twitter posts are work-friendly.
Do not merely list items on your CV. This interview is an opportunity to deliver the positives you have that your CV doesn't express.
Say thank you to your interviewer at the end and after by email or send a 'thank you' card by post.
Interact, maybe, with the interviewer's twitter profile.
Eat properly beforehand - and no smelly meals!
Advice for those looking for employment:
"Say it clearly. When you are sending out CVs, catch the prospective employer’s attention with a brief and concise cover letter that spells out clearly how your credentials match the job requirements.Connect the dots for the reader, making it obvious why you’re the perfect candidate for the job."