I've just had a Gnome 3 developer tell me that I could get floating panels. He indicated that,

"...you can use the fallback mode and still create floating panels (just
press alt+right-click on an existing panel)."

I can't seem to do this using Gnome 3 logged into the fallback Gnome3 desktop.
Has anyone else done this? I'd really like vertically oriented floating panels again...

I've tried the new version of Cinnamon and still find it lacking (no vertical floating panels) when compared to the Gnome 2.x desktops.

Please lemme know if I've missed something here...