I remember working on a presentation for the VP of Enterprise Architecture at Target when I was there, and it had one whole slide of info on biometrics! I did a lot of research, actually, and I am really looking forward to more biometric products, especially the prices coming down....
It's simply wonderful for some applications. Like, logging in to your laptop, or your medicine chest, or your cabinet full of nasty cleaner, anything that is not too critical. Laptop is even a stretch, since one can lift your print and root your machine in no time. I mention it since IBM Lenovo has already deployed it.
However, clearly, the applications where it will not work well are the ones where your finger goes where thousands of dirty, snotty, urine-soaked, poo-stained, ketchup-covered, gunk-laden fingers have gone before. Ick!.
"I know what finger I would use for this" list of problems:::
Problem 1: GROSS. Ewwwwwww. It's so, so gross.
Problem 2: Big Brother - oh sure Wal-Mart, take my biometric info - I'm sure you won't be hacked like Visa, Mastercard, Chase, and the list goes on...