I hadn’t heard of this web mail provider until a recent blog post from their site where they discuss security options for OpenID. Thanks for the mention, LuxSci.
Secure ID Card or USB Token: With one of these devices, you authenticate yourself by having the device in your possession and connecting it to your computer when you want to login. This is very secure and can be combined with a password for two-factor authentication and strong hardware-based security
TrustBearer is the leading company providing OpenIDs that work with such hardware devices. They also sell their own device.
Biometrics: Perhaps the most secure way of authenticating is the use of Biometrics. The most common way to do this is to have a USB device which will read your fingerprint and verify it so that only you can login to your OpenID.
TrustBearer supports this. The account is free. All you need is the fingerprint reader.
A note on the biometrics device support: Currently, TrustBearer OpenID supports the Privaris plusID personal fingerprint reader and the Precise Biometrics 200MC & 250MC with a PIV smart card with Match-On-Card support. We’ve received a few emails about supporting the IBM/Lenovo ThinkPad fingerprint readers. We do not yet support these biometric readers.