Our API directory now includes 76 storage APIs. The newest is the Pervasive Data Integrator API. The most popular, in terms of mashups, is the Amazon S3 API. We list 77 Zillow mashups. Below you'll find some more stats from the directory, including the entire list of storage APIs.
RESTful approaches to APIs have made them easier to deploy and consume, leading to a recent explosion in the number of available APIs. One byproduct of such growth is there are a lot of APIs offering similar or even duplicate services, but that have very different approaches to delivering their APIs. Cloud computing and social networking are two areas where we’ve seen the growth in APIs. As the number of APIs grow, the need for interoperability increases.
ReadWriteWeb's Rick Turoczy recently reported in "Dark Side of the Cloud" the recent incident that resulted in a loss of data for ylastic, a company that facilitates management of Amazon's AWS environments for businesses.