Talk about unique things you have done, not the same class everyone else at the career fair has taken. Projects, work outside of school, sports you play. The less you talk about your school the better in most cases. Attempt to find some random common ground so the recruiter remembers you.
Post your resume to the help thread or get it reviewed somewhere. Print off a dozen or two copies (it should be 1 page long) and bring it to the career fair.
If your goal is purely to get an internship/job - I would recommend avoiding any companies you have heard of. You will have to compete to be remembered with a ton of other people. Go to the booths that have short lines and less competition.