First and foremost: proper preparation prevents poor performance! Go over some interview questions. Make sure to shake everyone's hands when you meet them and when you leave; thank them as well. Greet people by their names when they are introduced to you.
Make sure you thoroughly understand the position you are applying for as well as the department it is in. Read up on the company at their website; be familiar with their work; you may even be able to see pics of their staff and maybe even the person/people you will be interviewing with. This is really helpful because their faces will be familiar to you when you meet them; calms the nerves a bit.
You may want to bring some type of visual aid with you, something to show relevant work you have done, or something general that you can make relevant. For example a project that demonstrates creativity etc. Wait until they bring up a relevant point and then ask if they would like to see what you have brought.
If you don't have much relevant work experience draw upon volunteer or college class work/projects. It will be up to you to demonstrate how they are relevant.
Another good point is to always have some basic follow up questions. You probably only want to ask 2 or three max. At least one standard is 'what do you see as the most challenging part of the position'; try to follow their comment by saying you are familiar with whatever they say or briefly explaining that you can handle that situation etc.
The thank you note is an excellent idea so try to remember the names of the people you meet or ask for their business cards.
Basically an interview is about marketing and your product is your experience, knowledge, and creativity etc. You want to advertise these things and make them desirable to the company but try to avoid false advertising by exaggerating; stick to your true personality, experience etc.
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