I have a dream of a library classroom where the instructor controls the computers students use. No more students checking their e-mail or MySpace page. No choice but to pay attention (or sleep). The instructor can even direct all student computers to the same website. Several software/hardware products, called Classroom Management Systems, make this possible. The Teaching Methods Committee of ACRL provides a list comparing many of these products at http://www.ala.org/ala/mgrps/divs/acrl/about/sections/is/projpubs/classroomcontrolsys/classroomcontrol.cfm.
Someday my dream will come true.
PS. If you have experience using a Classroom Management System, please post a comment with your opinion of the system you use.