Interview tips?

[VaeVictis]

Eye contact is a big one, but be careful not to stare (bring a note pad for notes so you can occasionally glance at it to break it up).
Bring some questions ready, it lets them know you're interested and have done research (i.e. What does it take to be successful at (company name?)'.
If you are asked about a weakness, put a positive spin on it (i.e. 'Sometimes it appears that I may be slow to make a decision, but I like to do things right the first time.').
Firm handshakes, but not 'HULK SMASH!' handshakes.
Be ready for potential tricky questions (i.e. 'Where do you see yourself in 5 years?').
Lastly: smile, pay attention, and show up five minutes early.