Look, everyone who has seen my posts know I'm as anti-Apple as they come. That being said, no you should not feel guilty for owning an iPhone, iPod or iPad... at least, not for the reasons specified.
China and many of these Asian countries are in the middle of their economic/industrial revolution. They are morphing from subsistance farming to being players in the industrial game at the global scale. First, they start by producing things based on our designs. But it won't be long before they are producing things on their own designs and making significant contributions to the state of technology in the world (and improving their own standard of living.
Shenzhen, where the Foxconn factory is located, started out as a small fishing town in the 1980s. It has a population of about 70,000 and looked like a shanty town. Today, it has a population of over 8,000,000 and looks more like New York City. They people working in those factories aren't being marched in there at gun point, they are there to improve their lives. They'll work hard for a couple of years (during which time everything is paid for by the company), then take the sum total of their earnings home and start small businesses or families.
In time, their labor standards will also rise and they won't be so different from us. However, you can forget about bringing these jobs back to the US. Nobody here wants to work 12-hours/day, 7-days/week for $150/month. And nobody would buy (or could afford) products made here if the assembly workers were paid American wage minimums.