It appears FOSRestBundle seems to be the main point of the article, and adding support for the LINK and UNLINK HTTP verbs is also interesting. There's also the

It appears FOSRestBundle seems to be the main point of the article, and adding support for the LINK and UNLINK HTTP verbs is also interesting. There's also the allusion to custom content-types and versioning schemes and a small bit about using the SF2 web client and crawler for (unit) testing.