More and more business laptops, tablets, and other mobile devices have built-in biometric fingerprint scanners. They actually work amazingly well. My Lenovo Thinkpad X200 tablet has this scanner and I use it to log into Windows. I can also use this fingerprint scanner to store all my other passwords. My old tiny Fujitsu Lifebook p1610 also had a fingerprint scanner and the Samsung Q1 Ultra UMPC comes with a scanner.