I like the article that Kent referred to.

Sometimes the interviewer is looking for your problem-solving ability.
AceTheInterview.com has a list of some Microsoft questions at
http://www.acetheinterview.com/qanda/microsoft_interview.html .

The CollegeGrad.com site has categorized eight types of interview
questions at http://www.collegegrad.com/jobsearch/16-4.shtml .

It's also good to bear in mind that the interviewer is trying to figure
out if you would be a good coworker, not necessarily a programming
genius. So I'll echo Hal's sentiments and add: get there 15 minutes
before the interview, and walk up to the receptionist at 5 minutes
before. (And don't proposition the receptionist, either!)

Toward the end of the interview, they will often ask at the end if you
have any questions. They're really trying to gauge your level of
interest in the company and the job. It might be good to read up on the
company before the interview. You might want to use the 5-15 minutes to
read that annual report gracing the coffee table.

Best wishes for finding the right job.