Not sure if this is the correct forum for this but I noticed a new App in the App Store last night called "LightPad". It's a very light weight Indigo App that let's you control a maximum of 6 lights. It costs $2.50 (in the Australian App Store, maybe less in the US). To configure it you need to enter the device ID and a friendly name. I'm guessing the App just sends a simple RESTFUL command to Indigo referencing the device ID. There's no device state reading so each light just has an "On" and "Off" button. It's certainly not an Indigo Touch replacement (by any means). I think the premise of the App is to allow very quick control of lights. It appears to be a very cool idea and is well executed.... except... as yet it doesn't support authentication.
**Update - 24/02/2015** - Please read later posts, authentication is now supported.
I was a little peeved to discover the no authentication aspect after purchasing the App as nowhere on the App Store description does it mention this. I'm very happy to support this but they really should be upfront about not supporting authentication. I imagine that most Indigo users are using authentication. As a result it's now just another app icon taking up real-estate.