EDIT 09 July 2012: The Microsoft Indic Language Input Tool has a new url - http://bhashaindia.com/ilit
From today, bloggers and site owners can embed the Web version of Microsoft Indic Language Input Tool to their blog, site. This facilitates easy search, form-filling and discussions in your language on your site by anyone who visits it, without requiring them to install anything.
There are 2 modes in which you may enable Indic Language Input on your website: the Opt-out mode and the Opt-in mode.
In the Opt-out mode, all supported input fields on the page are transliteration-enabled except those that you specifically wish to disable. This is recommended when you want most or all of your site to be transliteration-enabled, such as your intra-website search box and various form fields and comments boxes but not, say, a URL or email address field.
In the Opt-in mode, only those input fields are transliteration-enabled that you specify. This is recommended if you want only a few input fields on your site to be transliteration-enabled, such as, say, only a comments box and nothing else.
It only requires to copy-paste HTML code into your website or blog template, and possibly adding an attribute to the opening tag of some HTML controls
Separate instructions for adding the Web version of Microsoft Indic Language Input Tool to your website are available for each language, check the following links for instructions -
EDIT: 09 July 2012 : The Microsoft Indic Language Input Tool has a new url - http://bhashaindia.com/ilit
This service is provided free for non-commercial use only.
(Source: Microsoft Indic Language Input Tool Blog )