Now you can allow visitors to your website to type in Hindi, even if they don't have a Hindi keyboard. Google has released a Virtual Hindi Keyboard that you can use:

To address this issue, today, we added Virtual Keyboard API into the Google AJAX Language API. With this API, developers can help their users to input text, regardless if they have the native keyboard layout installed in their Operating Systems or not.
Google Code Blog: Introducing the Virtual Keyboard API

This is a big step forward for Hindi on the internet.