Apart from obviously being excited about the interest in the plug-in, I was also really surprised by the wide range of uses people have found for it.
In addition to the perhaps more expected research purposes (transcription, query-by-humming, computational musicology and ethnomusicology, music similarity, structure analysis, etc.), people have downloaded it for educational use in schools and universities, for music composition (for example for synthesizing natural sounding vibrato by using the pitch curve generated by a real singer, or for vocaloid compositions), for checking out the current state-of-the-art (including some commercial companies...), and even just to "view music in a different way" and "for fun".
So... what next? :)
If you haven't already, you can try out MELODIA for yourself, it's free.