Data Portability is the option to use your personal data between trusted applications and vendors. That’s not as clear as it should be, but it does imply that you own the data, the option to use it, and the decisions about trust.
So what options do vendors have? According to Mike Arrington, they can make announcements about Data Portability while fighting for control of your data, so that Data Portability is the new walled garden.
You can get a more concrete and interactive view of vendor options by playing the game hosted at ReadWriteWeb:
you can choose to play the role of any of 5 different players: Google, MySpace, Microsoft, the Data Portability Project, or Facebook. You can then predict what will happen, or voice your opinion about what should happen. Or both.
These players will no doubt make further moves next week. More then.