I'm extremely troubled by the fact that this essentially gives a blank check to the government to take anyone's property at any time. They don't have to show blight or anything. They can force you out of your home, against your will, as long as they give you some money back (amount determined by themselves). If a group of residents in one area do not want their homes bulldozed to make way for a Wal Mart, then that Wal Mart ought to find somewhere else where the residents ARE willing to give up their homes. That's how the free market is supposed to work - offer enough money that people are motivated to leave, and if they're still not motivated, then find somewhere else.
Essentially, this ruling puts the rights of corporations and developers above citizens.