Thanks for the information, that's one product I'm not too familiar with. I've demoed the Antares product and a couple of freebies. (It seems like there is a couple of newer plugins out there as well, eg Synchro Arts Revoice Pro).
The problem is, I'm not sure though that even a pure alternate tuning can work though for all examples. EG: for blue notes, what is "correct" varies with performers and style.
Now, I'm more talking about the "automatic modes"; I understand Melodyne offers a pretty impressive level of editing control (Antares did too from what I remember). So it would certainly be possible to get a really great take, and then hand-correct any truly off notes to whatever frequency you wanted.
As in many things (see: Photoshop and model photos), a lot of the reaction to the tool is less on how it could be used, and more on how it is being used in glossy "crap singer pop idol" productions.
