We generally prefer MacBook mods that only require a littlephysical abuse, but if you are feeling really ballsy then this MacBook mod may provide a good start. Fresh out of the box blogspot user, edahc, used his superior Dremel and soldering skills to install a biometric fingerprint scanner on the right side of his MacBook. I don't know about you, but it would take a lot of alcohol for me to take a Dremel to a MacBook. Nice mod, nonetheless.
Hit the linkage for the complete, crappy camera-shot gallery and more information.
MacBook Pro Biometrics [Tech Stuff]