The line between what constitutes a platform versus an application is getting more blurry with each passing day. Applications are increasingly coming complete with SDKs that provide developers with access to APIs through which they can extend the application. Case in point is Decisyon, which recently launched a Decisyon 360 collaborative decision making (CDM) environment that makes extensive use of RESTful APIs and Web Services that are exposed via an SDK.
Box.Net is on a mission to increase adoption of its file storage service with consumers. After successful adoption of its service with enterprise customers, it is clearly determined to woo mobile device owners by providing them with large amounts of free space (50GB!). To make it easier, it is partnering with device manufacturers like LG to provide the free space seamlessly via the Box.net API.
PostalMethods is a service that frees businesses from needing their own staff to mail out invoices, confirmations, and other messages via printed postal mail. The service is available using standard email software, but PostalMethods also offers an API that enables businesses to integrate their postal mailing service directly into automated business processes.