At Mix09, Microsoft released a new Microsoft Translator web page widget that allows real-time, in-place translations to web site /blog contents. Users can see your pages in their own language, without having to go to a separate translation web site, and share your page with friends in multiple languages.
Also the new Microsoft Translator AJAX API allows you to easily integrate translation functionality into your web applications and sites. You can learn more about our APIs on MSDN, try out the interactive SDK or interact with other developers on the Microsoft Translator forums.
More info: Get AJAX API