I work for VoiceVault (http://www.voicevault.com) and we are making available, for free, our voice biometric API. This enables you to develop applications on smartphones and tablets that make use of voice biometrics for identity verification, voice signatures, application access etc.
The development program is available to all and you can register here.
The program is supported via out Developer Forum here.
And, if this wasn't enough, we've just launched a developer challenge within the above program with a $1000 cash prize.
To quote our challenge blog post... "We’ll award the prize to the application or service that uses the mobile device to make the best and most original use of voice biometrics (or vice versa). We want to see device characteristics being used to their best advantage – especially in what they bring to multifactor authentication (for example ownership of the device itself, it’s location, the app registration process etc). We want to see innovation, creativity and business acumen – where the use of voice biometrics in an application enhances it or the user experience associated with it. And of course that raises the bar in how voice biometric technology on smartphone platforms will really drive adoption in the future (and enrich our lives for the better!)."
Closing date is ages away – February 18th 2011 so you’ve plenty of time to write that killer app.