After looking over the site I only found one thread that really looked in depth at any of the smartphone apps out there for BBB: SimplePool App for Android. A Review.
I have the free version of that application and I've considered buying it but I also have an iPhone. That application is not available on the Apple iPhone so I wanted to offer up some reviews of the apps that I have been able to find and try and those that I have not tried and why.
This thread is intended to be collaborative - feel free to offer your opinions and insights. My only request is that Android apps should be setup in their own thread like this one. I may do that thread myself if no one else jumps in.