Hey all, I haven't seen this topic here yet..sorry if it's been covered.
I've found that ratios ARE available when using multiple pocketwizards.
You can do it by using the flash exposure compensation on the individual flash.
I've taken 3 photos (I think I can only post two though) that have full power on both,
then -1 2/3 flash, then another with -3 stops on the left flash only.
This might not be as handy as the "on camera" solution that canon offers, or the new PW gizmo
that will be released soon, but if you don't mind the short walk to the flash itself, you
can adjust the ratios to better suit your needs.
580ex2 on the left and 430ex2 on the right were used.
Hope this is useful.