Christofer Hoff (Chief Security Strategist, Architect, CISO, Security Visionary and Evangelist/Prophet, Brick layer, priest and short order cook…) proposed a Cloud Computing Taxonomy & Ontology on his “Rational Survivability” blog.

Maybe this is not completely obvious from the diagram below, but my first impression is that Hoff’s conceptualization of the “Cloud” reminds me of the architecture that has been proposed for the MPEG-M (MPEG eXtensible Middleware).

The MXM Architecture: