Yes, Minecraft (http://www.stick-online.com/boards/index.php?topic=1381.0) has been remade onto iTouch/iPhone, and is called Eden - World Builder.
I am playing it on my jailbroken iTouch 2G, and it is sweet. I highly recommend it to any Minecraft fan. :)
http://itunes.apple.com/us/app/eden-world-builder/id405743220?mt=8
I get a connection error when I try to connect to the shared list. Also, the build options are limited. Other than that, the game is okay.
Shared list is down at the moment, but will be back up. This is only the first version of the game. More building options will be added. I personally think it's pretty cool for being on an iPod Touch, even if it does not yet have as much of a variety of blocks/objects as the original Minecraft. Also, try blowing up some TNT in random places. I found some awesome caves, haha.