ICLiC 30 pin Apple iPhone 4S 4 3GS 3G Nano Touch Plug Cable Dock Charger Extender
The ICLiC extender does what is supposed to.  Tried it on more than one dock, with a couple different iPhones from my household, and iPod, and even a 2nd generation iPad (I do not know about the newest model, 3rd-gen at the time of writing).  Works with thick, protective cases, and there's no question it should work with thin ones.  If I were to mention a drawback it would be that it rises the iphone/ipod about a quarter of an inch.  If the dock does not provide support to the back of the device (i.e. if th