Another great idea from these two Chicago guys running Inkling Markets. Midas Oracle, too, will soon adopt OpenID.
Psstt… By the way, thanks to all the publicity on their frontpage and on Midas Oracle, there are now 60 prospects (from big companies to academics) who have opened a free, private, play-money betting exchange for forecasting purposes. Obviously, Adam Siegel and Nate Kontny are onto something. Consensus Point and NewsFutures will have to react, soon or later.
UPDATE: I have installed OpenID. Let me know.