Here's the news from Skype's website:
Skype, the Global Internet Telephony Company, today announced the beta of its Skype API (Application Program Interface) included in the latest version of Skype for Windows, enabling hardware devices and software applications to seamlessly integrate with Skype's award-winning Internet telephony software. Skype currently has more than 14.5 million users from every country in the world, and is adding approximately 100,000 new users per day.
"We offer the Skype API to expand quality voice and messaging communications around the globe," said Niklas Zennström, Skype CEO and co-founder. "With this API, Skype is now an open platform and we are keen to watch the world's innovative developer community integrate the Skype application to extend the potential of global communications."
Non-commercial developers worldwide may freely integrate the Skype API in compliance with the Skype software End User License Agreement (EULA). A software development kit which includes documentation, sample code, and other information is available at http://www.skype.com/community/devzone
Commercial, affiliate and other Skype partnership opportunities are handled on an individual basis. Companies and individuals with business proposals are encouraged to contact firstname.lastname@example.org.
The Skype API is freely available with the latest version of Skype for Windows at www.skype.com/go/getskype.