Obviously I've yet to add support for legacies, foci, and the notion of the current lens. I'm still poking at possible interfaces for these. Also to be added: deletion of unwanted cards and preventing you from adding cards after the ending bookend.

I would like some thought about authentication, or lack thereof. I've got a few ideas.

• Users log in with their Google accounts, send invites to other people with Google accounts, and in general you have a list of all the Microscope sessions you've been working on.
• The same as above, but s/Google/Twitter/.
• The same as above, but s/Google/Facebook/ and then I cry alone in a corner.
• No authentication at all; you have a magic url which gives you access to the session, but which is impossible to guess, and you have to share that url with your co-creators.

Please note that I have been testing this mainly on Chrome. Please report any problems with Firefox and Safari. I don't care about IE or Opera; use a real browser.

Give the demo a try.