Two Factor Authentication using your Mobile Phone and for free.
I am a big fan of two factor authentication where possible for high value logins. This is where you enter a changing number to go with your password. This number comes from a device you carry with you. In particular I use the free Verisign mobile token on my iPhone. They make it for many other cell phones. You can install and use it for free with services like paypal, ebay, some banks and even with the free service called PiP (Personal Identity Portal) from Verisign.
The free token program can be found at:
https://vipmobile.verisign.com/
You can get a pip account and use it for any site that supports openID. Giving you two factor authentication even for a lot of blog commenting and forum systems. PiP can be found at:
https://pip.verisignlabs.com/
Verisign has a quick demo video of the mobile token on youTube. Check it out and add some extra protection to your accounts. Especially if you use eBay or paypal.
