Alternative methods to login to Windows

I've always wanted some cool way to log into Windows like inserting a designated USB or voice recognition. For example there's Blink (pictured bellow) which uses facial recognition to log into your PC.

What alternative ways are there to log into your PC?

Well there are the fingerprint readers built into most new laptops.

You can even buy USB readers for laptops or desktops that don't have one.

If that isn't futuristic enough you can get an iris recognition camera. Here's one built into a mouse

This page mentions signature recognition:

the Penflow client-server application which allows easy and secure signature authentication process

You can also use a USB Flash Drive as logon replacement.

Most such products are commercial.
A free product is Blue Micro USB Flash Drive Logon:

The Blue Micro USB Flash Drive Logon turns your existing pendrive or flash drive into a key to logon to your pc. This makes it easier for users to manage their windows account passwords. This software creates a encrypted code on your pendrive, only understood by this software. This software can be installed on Windows XP and 2000 only. This software can be downloaded for free. You would have to register and log into our website in order to download it.

There are some methods to do automated login using the Bluetooth connection to your phone. Unfortunately, after evaluating about 8 solutions, all of them (without exception) were buggy and didn't work well. Seems odd, as the script to do this is only about 8 lines of code. Market opportunity, anyone?