Just read that Microsoft is all set to introduce a new range of mouse and keyboards, including models with built-in fingerprint reader. Now that would really make life much simpler as one will not need to remember that long list of passwords across various applications and websites.
However, I am slightly skeptical of the security if the data from these mouse or keyboard is not encrypted. If the data is encoded in some way by a software for the biometric input to retrieve it, it shouldn't be a big deal for a worm or the spywares to extract it from that software.
Maybe this would also be another of those cases of compromising security for convenience.