Microsoft OneNote is a notebook tool to take and organize notes. The OneNote service API allows developers to integrate and manipulate OneNote user data in their own applications on a variety of platforms and devices.
This code sample gives users examples of how to use OneNote API with Windows Store.
In a world where real-time data streams are becoming much more common, and with the volume of that data continuing to increase, it makes sense that a framework would be developed to increase the ease at which that data can be processed. Yahoo! S4 isn't the first such framework to be concieved, or even open sourced, but it is likely to massively increase awareness that such frameworks exist, what problems they may help solve and get developers thinking about how they could use the technology and potentially increase the likelihood of somebody moving S4-like capabilities into the cloud and offering it as as service.