The Stipple API is free, has no request limits as of yet, and OAUTH 2 will be supported in the future. According to its website on the API, it is "inspired by REST". Stipple announces its rare downtime, which is usually used to migrate data, via its twitter account.
When video rental and streaming company Netflix released its Netflix API, it was meant to support its DVD-by-mail business. In the time since the Netflix API was released, the business has shifted to streaming instant video, from hundreds of devices. Meanwhile, the Netflix API hasn't changed much and it's time for a redesign, according to Netflix's Daniel Jacobson in his talk at OSCon Wednesday. Jacobson's talk offers examples of how the next iteration might look, including doing away with versions, but creating unique endpoints for each partner's application.