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."