I have been waiting on an app like this. I was looking for an android dev to actually help me make an app like this for a secret build I have been working on.
So what it does:
It allows you to use and customize inputs from current and classic game controllers through USB or bluetooth.
app link look for something real cool from me soon.
side note
If you dont have usb host support you might be able to use an adapter that converts your microSD port into a usb port. I have one I can try testing this on later. I will need to update my tablet to 3.01 or what ever the requirements are and test. Then I will test my galaxy s .