Fingerprint ID Door Locks?

Wacko asks: "What would be the cheapest way to implement a fingerprint door entry system? I was looking at the Compaq Fingerprint Indentification Technology which I hear is about 60 quid (Uk money that :). If that was linked up to an electronic door lock (like door entry systems) it would make a cool entry system. However, is this feasible and is there any software that could perform this (especially software for Linux)." Sounds good, but how secure are these things?