One of the biggest challenges Microsoft has faced with its Windows Phone platform is that it's far behind in the apps race against iOS and Android. One way to close the gap is to lower the barrier to entry for new app devs, and Microsoft has done so with Windows Phone App Studio, a hosted service that lets you build applications without actually writing any code. The description of how App Studio works may leave you wondering how useful or exciting the apps created will be, but a surge of developer interest during the current beta program has surprised even Microsoft with its scope.