Has anyone here had success with USB fingerprint scanners?
I also found this Microsoft keyboard with fingerprint reader but I don't know if it works with linux.
I use the DigitalPersona 4500 with libfprint. Unfortunately, there are multiple revisions of the device with the same model number and only some of them work properly under Linux (different encryption method I believe). As far as I know this is not actually documented anywhere. Googling just shows a bunch of unresolved bug reports of people having no idea why it doesn't work.