The first thing I do whenever I get new Apple gear is think to myself, 'How can I void the warranty?' Usually I just dunk the machine in a vat of butter milk, but
edahc is a little more creative than I am (and handier with a dremmel it would seem). He installed a fingerprint scanner in his new MacBook Pro, and documented the whole process in case you're as paranoid and handy as he is.
Let us know if you try this yourself.