This is cool. Just type a word in English and press space bar. Google Transliterate will automatically translate the typed text into the devnagri (Hindi/Marathi/Sanskrit...) script. And if the transliteration is not correct, all you have to do is click on the transliterated text and Google will provide you nearest relevant matches. And if that is also not enough, it will even allow you to edit word.
Just copy and paste the transliterated script where ever you want to post/publish it.