The Dropbox Java SDK provides developers access to Dropbox for integration with other applications and devices. Dropbox is a file storage, sharing, and synching service that allows users to store, share, and sync their files.
Developers with a penchant for green-energy powered APIs should probably take a look at GreenQloud's IaaS offerings that are API-compatible with Amazon's EC2 and S3 services. The Icelandic company's datacenters survive on nothing but 100 percent renewable energy.
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.