Provide materials in multiple formats. In addition to print and web pages, consider putting library instruction materials on audiocassette for students who are visually impaired or auditory learners. Create assignments that eager students can complete and return to a librarian. Even if no grades are awarded, it gives interested students the opportunity to see that they've mastered the material. Instruction doesn't always have to be in a lecture format.
Some students learn better in groups.
Give a group a problem to work on, then have each group report their findings to the class. Help prevent student frustration. Be proactive in working with instructors to develop library assignments. This way you can avoid assignments that have dozens or even hundreds of students trying to find a limited number of resources. Often the only thing students learn from these assignments is that the library is hard to use and resources are impossible to track down.