Spectator mode (ie. first version of multiuser support) is almost ready, hoping to get it in tomorrow.

Note that currently everyone gets their own instance of the Minion, so you can't share your encounter just yet - it'll require the feature I mentioned in the first comment. And yes, I'm working on it :)

I tried it with this gadget wave-ide.appspot.com/iframe.xml and it worked.

That would be awesome. I'm having some difficulties loading up minion in an iframe gadget right now though. Any thoughts on why that is?

I'm working on a D&D combat assistant (see my profile for more info and URL), and this feature dndminion.uservoice.com/pages/31073-gene... would probably enable using it in a Google Wave gadget. What do you think?