> Makes sense.  Is there any way to get the state change callbacks
> _without_ using the robot to manage the shared states?

I don't think so. To get a callback you either need
  - someone (robot or ordinary user) to join or leave the Wave,
  - or someone (robot or ordinary user) to change a gadget state,
  - or the user must change the mode of the gadget (start/stop
playback or editing).
At least, that's how I read  
http://code.google.com/apis/wave/extensions/gadgets/reference.html

So it's a bot...or yourself with a pen and pencil.  :-)

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