API Code Samples via Gists
Code samples in a variety of languages are how API owners help developers understand an API in the language that makes the most sense to them.
Not all developers will understand REST, HTTP and other things you might take for granted. Very simple code samples will help demonstrate an APIs functionality, making the learning process a hands-on experience.
Github Gists can be a much sexier, and easier to implement alternative to html <code> tags. While also allowing easy management and versioning of API code samples alongside Github API SDK repositories.