Google's long anticipated plan to "out open" Facebook begins to materialize with the OpenSocial API. LinkedIn, Orkut, Ning, SixApart - all companies facing the risk of a Facebook squeeze - are launch partners.
The countdown to the first "OpenSocial" Facebook application has begun. And one guesses that such an app would be considered in violation of Facebook TOS - so we'll see tons of these pop up - in the same spirit as P2P file sharing - until Facebook just adapts.
Marc Andreesen's post seems the most comprehensive.