And by the way... anybody who doesn't realize that the post-pc era has begun need to take another look at the current market of devices. And to reiterate a previous post, post-pc does not mean no pc.
Consider how many tablets have already been sold. This market didn't even exist a little over a year ago! And don't forget the non-apple tablets. They may not sell a well as they ipads, but they will improve, as will the ipad itself.
So, now consider where the tablet market will be 4 years from now. And 10 years from now. Nobody will buy a full sized laptop or desktop unless they need to (e.g. power users, gamers, etc.). The tablet is more accessible and ergonomic for day to day use (e.g. internet browsing, etc.). And this will only improve as tablets evolve. What will the "average" person need a laptop or desktop for in the future, when the equivalent of a multi-core i7 tablet with dedicated graphics exists? One that you can use with external monitors and keyboards? The traditional pc will always exist, but it will be overshadowed by it's more accessible sibling, the tablet.