RightScale, Scalr, EnStratus: Comparing the APIs

Nerval's Lobster writes "Back in May, I took a look at three cloud management platforms: RightScale, Scalr, and enStratus. Perhaps the biggest surprise was that people from two of those companies—RightScale and Scalr—took note of the article and replied in the comments, offering some clarification on their offerings. (And they were very civil: thank you!) What I'd like to do next is re-visit these platforms, but focus directly on the APIs that the three offer—not so much coding, but a high-level picture of them. How do they stack up? What features do they have? How do they fit with standards? And what can you expect from the long-term?"