Having a good basic understanding of a company you may be interested in working for, will enable you to get right to the point when you have the opportunity to ask questions in person.

You will ask more useful questions, as well as make a better impression than a person who has not prepared ahead.
Figure out your targets, companies with open positions and companies you want to know more about regardless of whether they have open positions.
Check out their website, and google the company name and the names of your interviewers.
Make note of press releases on the website and anything labeled "New".
If a company of interest is attending a job fair, go and check out their booth, ask questions and make a contact.
This will help you develop questions around what the comapny is currently working on.
Follow up. Once you have met with an employer, get their contact information, and take some notes to remind you of points you want to follow up on, additional questions you may have thought of, and any specific recommended action. Follow up with a thank you note or email to express your appreciation and solidify your good impression.

Check out my answer to comments under past blogs, let me know what you think by logging in and posting or e-mails jobs@bangordailynews.net
Happy Job hunting!
Lisa