So, does the full version of Melodyne support multi-track display? I've found when comping vox and using Melodyne (included with SONAR) what I really want to see is a ghost image of another track's blobs. It doesn't even need to be audible, but different instances of Melodyne never open with the same zoom settings, even when it's the same region being selected, so toggling back and forth is quite a chore. Just being able to superimpose an uneditable track's blobs would make correcting pitches to a track a breeze. 

Wicked, I often need the same. I copy them to midi tracks and then I can display them in a PRV with as many different colors for the different tracks as I like. The PRV is sufficient for BLOB presentation imho.
 
Just drag the Melodyne tracks to midi tracks of like names. You don't have to route the midi anywhere.
 
I often use this when I want to see a part that I'm breaking down, but I don't care to change the pitch of anything. I'm just using Melodyne to extract all the chords being played -- all the scales -- the melodic line.
 
I have an upgraded version of Melodyne (multi-timbral)

Melodyne Essential, Assistant and Editor are all versions of Melodyne Singletrack. There is a multitrack version which is part of the Melodyne Studio bundle. The mutlitrack version is 32bit only. Here is a page describing the features for each version http://www.celemony.com/en/melodyne/functions

I'd really like this feature as well. Make a post about it in the feature request forum! :)