????Just as Jobs helped revolutionize personal computing with the Apple II, he also ushered what many now dub the "post-PC" era thanks to a slick slab of glass and aluminum called the iPad. Until last year, tablet computing was a nice idea stalled by bad execution. Users shunned early attempts by Microsoft and its partners to make tablet-laptop hybrids. Even Apple itself tried and failed to innovate with the Newton back in the early-1990s.

????With the iPad, Jobs and Apple seemed to get everything right: an enviable portable form factor, an accessible operating system similar to the iPhone's and a reasonable price. The iPad sold nearly 14.7 million units in 2010, and just last quarter, sales exploded 183%, proving that many people want a sizable yet portable device they can take anywhere.