as i write this, your comment already has three other replies, two of which i think are pretty good. but i can't help but put my own two cents in.
do you remember the industry's response to the iphone when it was first announced? most observers thought it was the dumbest thing they'd ever seen. the general reaction was that apple was suffering from hubris of monstrous proportions to think they could enter into this market, with no history or reputation, and succeed. i didn't know whether it would be successful or not, but i knew i wanted one, real bad. it turns out that there were a lot of us.
apple succeeded with the iphone far beyond anyone's wildest expectations. probably moreso than jobs himself thought possible. they didn't just make a successful product, they completely upended the mobile phone business. it will never be the same again.
with any luck, we are now entering another period exactly like that one. apple is about to release a product that most people think couldn't possibly be successful. no one is willing to come out and say it will be a huge flop this time, because apple is now on a decade-long winning streak. betting against them is foolish.
apple's tablet has the potential to shake up the computer business in the same way that the iphone shook up the mobile phone business. if it does, this could be the beginning of a very exciting time indeed.