There's a readymade solution from the OpenPandora people, or atleast one of them. Can't find it right now, though.
I think you are taking about the icontrol pad: http://www.icontrolpad.com/
Not a bad device, cosmetically not the best looking setup but with different styles and sizes of all the phones out there it was really the only solution. You could always mod it and make a streamlined case specifically for device though.
Thinkgeek has these on sale for $60 http://www.thinkgeek.com/electronics/cell-phone/eb2b/
Other than that you can use that wiimote program that I can't think of the name of and will edit in when I can get to my tablet. That works good enough and is essentially free, if you already have a Wii.
Tapatalk mobile post wooooooo