I spend a lot of time reading up on, and sometimes using various API's available "in the cloud" to develop applications or integrate data into websites. In many cases it is much easier to find access to complex data or functions using an open API from another company than it is to create it from scratch.
One area that I have always had a keen interest in is telecommunications, from my history in the industry I understand well how hard it can be to get access to the large telecommunications companies that hold the large majority of connections (whether wireless or wireline) to customers. It becomes almost impossible to find a way to get a new app in front of these carriers or their customer base if you do not have a long history showing 99.999 percent reliability in your application.
Well, GENBAND has opened up their API's to their A2 communications application server which is used for millions of ports communications services by some of the largest companies in the world.
Knowing that the developer community is different from the more corporate focused large companies they have provided access to their developer program through a development community that has been established, BUT, more importantly has launched (and then extended due to interest) a contest for developers with some really nice size cash prizes.