Julian has nailed the upshot of Kelo:

Now that the “liberal” justices on the court have sided with the drug warriors against cancer patients, and with a plan to rob people of their homes for the benefit of wealthy developers, will some court-watchers on the left begin to question the wisdom of having let economic freedom become the red-headed stepchild of modern jurisprudence?

. . . The straightforward implication is that any taking of a private residence to hand it over to a business, or just from a poor person to a wealthy person, will be a taking in service of a public purpose: As a general rule, the rich pay more taxes than the poor, and businesses pay more taxes than households.

That is, if you have something somebody richer than you wants, watch out. Good work, egalitarians, good work.
Don Boudreaux has a strong reaction, too.