In previous installments of this series, I’ve shown how you can quickly create REST-based services accessible via HTTP that allow you to easily store and retrieve data in a Windows Store app, using several different approaches including WCF Data Services, ASP.NET Web API, and the new Windows Azure Mobile Services. You can read all of the previous parts of the series here. I recommend reading the intro post and the post on Windows Azure Mobile Services at a minimum, so you’re familiar with the games I’m using to demonstrate the concepts in the series, and with the basics of mobile services.
As touch becomes a more and more prevalent means of interacting with PCs as well as phones and tablets (I’m typing this on a Lenovo Carbon X1 Touch laptop), developers should be aware of how to create touch-friendly sites and apps that help users make the most of touch-enabled devices.
If you’re building apps for the Windows Store, there’s good guidance available on touch interaction design on the Windows Store developer center.