Thanks. I'm looking for something simple enough that doesn't require any accounts. Looks like Shazam and Soundhound have no Web services and require registration. Midomi has recording widget, but no sample upload (that's somewhat weird).

Echoprint is open, I'll take a look at that. Echonest doesn't seem to have any service on their site (not sure how it's used).

Check out musicbrainz

Thanks. I thought it's more for meta information (I know VLC uses it to identify audio by meta tags). Looks like they support acoustic fingerprinting too: https://en.wikipedia.org/wiki/MusicBrainz#Fingerprinting

Soundhound doesn't (or didn't?) require registration if you're using the mobile app, if that's an option.

Such kind of stuff should really support something very simple. I.e. upload a file through a Web form, and get some result.

I agree, but I can also see their reasoning. It's much easier to script and abuse an HTTP form than it is to abuse a (presumably more locked down) phone app with access to a closed API.