iCade Mobile - a case-prefix with Bluetooth, capable of turning the iPhone into a kind of PSP. There is a variation for the iPad, it is called iCade Core.
Now Available. Under the cut - a couple of photos, description and price, 2 videos.
With these modules, gamers will be able to remember the good old tactile control. Although touch screens are suitable for games, sometimes (especially when it comes to racing, fast arcades or intense fighting games) the joystick is much more appropriate than the touchpad.
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ICade solves this problem. With the device for Iphone you get a 4-way navigation key and 4 action buttons.
The iPad can be mounted in a stand either vertically or horizontally.
Average cost of devices:
ICade Mobile - $ 80.
ICade Core - $ 100
PS
Also on the site ThinkGeek was found such a thing for $ 100.