I know that every interview is different, but some questions that I am always prepared for:
1) Why do you want this position?
2) What skills would you bring to this position?
3) What are your three best/worst qualities? (that's always a fun one!)
4) How would you deal with this situation.... (dealing with difficult people, a difficult coworker, a difficult/impossible assignment, a tight deadline, etc)
Basically, look at the key skills they are looking for (organization, verbal or written communication, multi-tasking, technical skill, etc.) and be prepared to give examples of your skills in those areas. Also, you need to expect questions specific to the job you are applying to. If you are applying for a small mammal biologist position, then you certainly better brush up on your small mammal knowledge, specifically for the state that you are applying!
Hope this helps someone. Lord knows that I have been through my share of interview!