Today I participated in the Cloud Standards & Interoperability panel at the IGT2009 conference, together with Shahar Evron of Zend Technologies, and moderated by Reuven Cohen. Reuven gave an overview of his involvement with various governments on the efforts to define and standardize "cloud", and Shahar presented an overview of the Zend Simple Cloud API (for PHP). I presented an overview of the Open Grid Forum's Open Cloud Computing Interface (OCCI).
The slides include a 20,000-foot view of the specification, a 5,000-foot view of the specification, and an eye-level view in which I illustrated the metadata travelling over the wire using the HTTP Header rendering.
Here's my presentation.