Does it really infer them using DSP from the mp3 - or does it look them up? If the former - that's very cool, though I wonder about the accuracy. It would be good to have way to try it out online.
Making it a webapp would make it much easier to trial, it wouldn't be narrowed to one app (winamp) - and piracy goes away. On the downside, you'd doing all that DSP on the server instead of spread over the clients.
Cool. I was thinking you sell both a webapp (free trial + normal price) and download (super-premium price!).
Uh... why don't you make your own webapp player? For the download version, you could setup a server on the user's computer, thus reusing the same server and client code (but the user doesn't have to be connected).
Making it a webapp would make it much easier to trial, it wouldn't be narrowed to one app (winamp) - and piracy goes away. On the downside, you'd doing all that DSP on the server instead of spread over the clients.