In 
early November 2009 we announced a developer contest to reward innovation on the Force.com platform for Salesforce using Appirio's Twilioforce library. Twilioforce makes it easy to use the Twilio API through APEX.
We knew that bring together our vibrant developer community with the vast number of people building for the Force.com would be exciting for everyone involved, and we can't wait to see what it yields for end-users of these voice-enabled solutions.
With the help of Kyle Roche and Aslam Bari from Appirio, Twilio is now available for development on Force.com, the Salesforce development platform. The Appirio team has implemented the Twilio API in APEX, which is the force.com backend language, so get ready to build scalable reliable voice and communications apps on the leading platform for business apps and website.
Developer Resources
Force.com for Twilio on Salesforce Code Share
