After a conversation with the recruiter, you want to make sure they have your name. Some may be collecting resumes. For others, a business card may be more appropriate.
You can order your own iSchool branded business cards sponsored by ASIS&T. Check them out at http://students.washington.edu/asis/business-cards/
If you have a conversation with an employer, be sure to ask for their business card when you’re finished! You want that information so you can follow up with them after the fair.