Is it yet reasonably possible to integrate OAuth or OpenID authentication as a means of signing into SharePoint?
Preferably, any obsolete account management features would be entirely hidden away and we wouldn't be required to ALSO manually create a local SharePoint account and match it with the external account. It should all be seamless, native or native-like functionality.
I have project sites that I want to invite people from other domains to participate in without requiring them to manage yet another username/password set. Many CMS systems are allowing for this now through something like Janrain Engage and it would be excellent to be able to leverage the power of SharePoint in this scenario.