So save each mix as a different CWP file. Simple enough.
Mix 1: My Great Song - The Berlin Wall Mix.cwp
Mix 2: My Great Song - The Studio 54 Mix.cwp
Mix 3: My Great Song - The AM Radio Mix.cwp
Mix 4: My Great Song - The Its Early in the Morning and I Had Too Many Bong Hits Version.cwp
Mix 5: My Great Song - The Others Sounded Like Crap Remix.cwp 

  

some of the new digital mixer (for live) can remember several mixes. If you dial it in at one venue you can recall it the next time you play there.

 
This is a great feature in Live - but it's a different thing.  Sonar is not really designed to be a live music mixing center (Live touts itself to DJ's as well) - its a recording studio (I think!)
 
Brian

I'm agreeing with John. I was wanting multiple versions of a mix in one cwp file. Since I couldn't, I starting saving versions in the project folder and don't see this as a problem. All nice and neat. Also, the bakers don't need to spend time programming the feature and making the product more complicated from a maintenance point of view. 

Nice idea TraceyStudios but I think we have a good way to do it already.

Sam

Mix Snapshots: Fun. 

I never use SAVE.  SAVE is destructive. Always use SAVE AS, adding alpha letters.

This means I have TOTAL PROJECT UNDO.

I also have auto save enabled and versioning. Minimal intrusion for protection.

Auto save should always save to new name, without the auto save prefix. And versioning should not change the file suffix.

Then we all could set it and not have to SAVE, SAVE AS,.....

When it comes time for mixing I also tend to bounce the full mix to a new track in the project, with the output of the new track set to my hardware out (not through the Master buss.)

This way, as I create a new mix and save new versions of the project file, my latest project file contains a stereo bounce of all my mixes for a quick comparison. As long as I keep my naming straight I can then easily solo to find the mix I want, save and close the latest project file, and open the cwp file that corresponds to the mix I liked.

Of course, if I do a lot of back and forth this gets messy fast, but I seldom do more than a couple of versions of mixes for the same song unless I'm tweaking to someone else's taste and they aren't there for the mix.

What I do that is similar to what people describe here is save the project to a new CWP at different stages in the process. For example,

song_name_tracked
song_name_edited
song_name_cleaned
song_name_sweetened
song_name_mix_yyyy-mm-dd
album_name_masters_yyyy-mm-dd

Peace,

Tunes

Nice tunekicker.

I could have a song with all my plugin set the way I want them. Maybe i want Mix 1 to start with drums and no bass and bring the bass in later. Maybe on Mix 2 I want to start off with the string section, bring the bass in later and then the drums, so I don't want to start off with everything at zero after I've got everything eq'd and set just right. This is also a good way for presenting different mix variations to a client to see which one they prefer.