Looks nice and simple. There's been so many attempts at these things: configuration management, api key management, secrets management.... They're all basically the same thing... But I guess the same can be said about a lot of tools
I view Config.ly as being useful for _anything you'd put in a class variable_. For example text copy or styling. And if you put it in Config.ly instead of hardcoding, you can avoid deploying which can be slow (e.g. for iOS it's days) -- and potentially even avoid having developers do the work altogether.
Does that make sense or do you view it differently?