Biometric/Token Authentication and Seamless Integration?

NeuralAbyss asks: "With all the recent discussions on biometric, password and token authentication, I thought I'd ask one simple question that no websites seem to be able to answer: What devices integrate transparently with pre-built infrastructure (Linux, *BSD, Novell, Windows NT/2K)? Any advice from Slashdot readers out there would be quite helpful, as I am looking into biometric/token authentication for a network that I administer, currently a Win2000/Novell hybrid."

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Something really unbelievable

[PD]

Finger print readers apparently are easy to foil now. Someone figured out how to make a case of a finger out of silicone to fool most readers on the market. Now, biometrics researchers are zeroing in on a new technique that's not so easily fooled. Buttocks pressure. Don't laugh! Apparently the way a person pushes on their chair with their buttocks is far more unique and foolproof than fingerprints. And the researchers claim they can ignore signal variation caused by weight gain or fidgeting.

Technology is so amazing that sometimes I have a hard time believing it is true...