Recently I viewed a blog post by Alex Iskold which highlighted the fact of security within e-learning in which he mentioned biometrics.
I think it is a great way to securly link a profile (account) to an individual. For one it would at least get rid of a few cards. On searching the web I came across this site.
I had not relised that this technology was at production stage. The technology could make it so much easier to take out library books, code bespoke programs tailored to the student and generally make the students life easier.