Amorphis

With how small they can make components, what I think would be fantastic, is to replace one of the (right?) analog sticks with a little trackball that you could roll with your thumb.

You'd have the faster/more fluid control of a mouse, but still just have the simplicity and comfort of a control pad. This way, you'd also be able to play RTS games, and put cursor responsive icons/menus on the screen to give games like (RPG's?) or the like more easy to use.

And hey, even the user doesn't have the trackball, you can still navigate play it with the analog sticks, it just might not be as smooth (in terms of an RTS/etc).

But for FPS games, that'd kick ass.