Requiring one hardware token per service can get cumbersome quite quickly. Fortunately for Android and Blackberry users, they can instead use the open source Google Authenticator project. This allows the use of a single mobile application for an arbitrary number of OTP enabled services:http://code.google.com/p/google-authenticator/
This is currently supported by (some) Google accounts and is available as a PAM module for use by any PAM-enabled system. That means, Linux users can easily enable OTP support for all their services.
I am the author of the sample PAM module, so feel free to ask questions in this thread.
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