Services module is a great tool for exposing API's of your website to other applications.
When we work with Services module most of of the changes can be done only in code. But sometimes clients ask to have configurable interface for GET calls we expose. For example client needs some "export" call for his another application that imports data from our site. This is where Services Views module can play its very nice role.
This article about very exciting feature of the Services Views module.
So please take a look at the demo:
Hope you have enjoyed this functionality and will take a try (and report any bugs to the issue queue) :)
There is alternative way to accomplish similar functionality -- to use Views Datasource but it will not be possible:
Services module's documentation.