I recently saw a patent for a computer mouse that came with a barcode scanner. I was think that, for security, computer mice could come with retinal scanner so that you can scan your eye and login. Wouldn't that be cool (and secure).

maybe, they could integrate a webcam with a retina scanner, but people with bad backs might not be able to use it.
The fingerprint scanner in my opinion is worse than the password, i 'hacked' into my friends computer because he doesn't believe the fingerprint sensor can be fooled. but after some memory latex, some handshakes, and some saliva I fooled the fingerprint sensor.
So a retina sensor would be a good idea, until someone fools it. but then what do we do? breath sensor?

next step after that is the dna verifier, just insert a sample of blood and your good to go. A retinal scanner might not be such a bad idea if they can be made cheaply enough and whatnot, and as long as it doesnt give you eye cancer.............