APIs and "fair use"

The Supreme Court sided with Google in its suit over the repurposing of APIs under the aegis of "fair use". They over-turned the lower court decision. This has huge implications for the technical world. As a frequent user of APIs, I found the case very interesting. It revolves around Google's attempt to Clean Room Design from the Java SE edition. Here are some takes: the ruling itself, the facts in non-legal language, the business perspective, the developer perspective, and the legal take.