RSS, Microformats, OpenID, Tagging - all these formats, protocols and practices are extending the underlying philosophies of the OSI Model to provide continuity across multi-vendor environments. In fact, an initiative to formalize this 'extention' is already on at dataportability.org . As they say on their website: The technologies already exist, we simply need a complete reference design to put the pieces together. [Their] mission [is] to put all existing technologies and initiatives in context to create a reference design for end-to-end Data Portability. To promote that design to the developer, vendor and end-user community. Notably, all the major players from Google/Yahoo/MySpace to Microsoft/Verisign are already a part of this initiative. However, this initiative, just like the OSI Model - has more to do with the developer/vendor community and little to do with common users. And this is where DataPortability needs to differ from the OSI Model.