Although this is a 2 yr. old thread, I'll still throwing in my 2 cents......
 
Sonnivox's Vocalizer (I only have Version 1) can do harmonies quite easily and the best part is you don't even have to sing in key....or even sing at all.   

Most of the time i do it the old fashioned way, but occasionally use Nectar 2 or meoldyne

Like to think that mouldy's fine for pitch correction and Vielklang for harmonies.

Hmm ... I use Melodyne to do that. To get the best results use an over dub (double or triple takes) for the harmony parts not the original. It sounds a lot more natural using a vocal take that is sung specifically to fatten a vocal line. Also, lessen the modulation a bit. Good back up harmonies are always sang a little blander than the lead. But, that's a matter of taste.

i just dont think anything can be improved upon,
beyond actual tracking of harmonies.
 
nothing beats the real thing

I picked up up Melda MMultibandHarmonizer on a sale. It has some interesting pitch tricks up it's sleeve.
 
http://www.meldaproduction.com/plugins/product.php?id=MMultiBandHarmonizer
 
PS: The latest issue of Computer Music magazine (CM220) features pitch and includes a CM version of Zplane's Vielklang and review/video for Elastique.

Razzlefrats. Give me a sword to fall on before I buy more plugins!
 
Now I've got Melda's MCreativeBundle on my list of stuff waiting for a sale. That looks like a great bundle.

TheMaartian
Razzlefrats. Give me a sword to fall on before I buy more plugins!

ROTFLMFAO!!
+1E6

batsbrew
i just dont think anything can be improved upon,
beyond actual tracking of harmonies.
 
nothing beats the real thing

That's the plugin I use. And Melodyne.