It's probably too late for the one-day event, but one thing we'd like to cover in the future, but don't really know much about, is biometrics.
What we'd ideally like to do is demonstrate face recognition software, from e.g. a webcam, and at least one other type of biometric identification. The obvious candidate is fingerprints since we already use a fingerprint password system in the school library. The snag is that a password system isn't really very transparent; you can't see what it's doing or why. What'd be much better is something like a fingerprint scanner that did all the CSI stuff - showed the print on screen, showed finding the ridges, then reduced everything to a numerical formula.
The snag, of course, is that I can't seem to find anything like this for sale, we don't have much money, and our PCs probably aren't nearly powerful enough anyway.
So does anyone know of anything suitable that'll run on 500mhz Windows XP boxes and isn't ludicrously expensive?