iCloud, not the new iPad, is Apple’s real key to the post-PC revolution — from ReadWriteWeb.com by Dan Frommer

Excerpt (emphasis DSC):

What makes the iPad, iPhone, iPod, Apple TV, and gradually, even the Mac, “post-PC” devices, is the idea that they’re all tied together behind the scenes: Your work, your entertainment, your apps, everything. It’s not that they just replace a PC in your home. It’s that they go beyond what a PC ever offered.

That’s where iCloud comes into play.