The Hip Screen Pad is basically a GameCube controller with a screen attached to it. It is apparently published by SJS group and claims to give you 'New Innovation' in portable gaming.
It also says it has a 'built-in High Resolution LCD screen' and, obviously, 'No T.V or monitor needed.'.

You can buy it now for about 100 dollars. There are also PS2 and Xbox versions.

To be honest, it looks a bit iffy. An included rumble would make the screen vibrate too, and it probably will affect the weight of the controller. Also, we don't know exactly how big the screen is...

I'll try and post the answers to these comments when I get them.