two-factor authentication using open standards (HOTP, TOTP and soon OCRA) for one-time-passwords
C library for inclusion in existing software and web sites
OpenID (using SimpleID) for web applications/single-sign-on (SSO)
PAM for easy UNIX and LDAP integration (SASL, RADIUS and JAAS in development)
enterprise class scalability and security
flexible, modular user data storage to suit a range of private and public use cases
free (GPL) and open source so that you can see the code is really secure
open standards (HOTP and TOTP) so you are not locked in to a single token vendor
combined PIN + token code login
Works with Google Authenticator or the dynalogin open-source soft-token on Android
Android soft-token
Based on a cryptographic algorithm so token codes can't be guessed - they appear random
A single install of the soft-token app can have multiple key profiles (e.g. one profile for your e-banking, another for the company VPN and another for your OpenID/blog/facebook), so there is no need to carry 5 different tokens on a keyring
Does not require any network connectivity when computing a token code
Can be used when roaming, even if you disable data connectivity while abroad
Does not require any SIM card, so it can be used on tablets and music players running Android