The list goes on....
In 2004, Jobs said that Apple would not introduce a video iPod, insisting the company was focused on music. We know what happened there.
In 2003, in an interview with Walt Mossberg at the All Things D conference, Jobs said Apple wouldn't do well in the cell phone business. Flash forward a few years.
During that same interview, he said Apple was not working on a tablet. "There are no plans to make a tablet," Jobs said. "It turns out people want keyboards.... We look at the tablet, and we think it is going to fail." Apparently, Apple filed a patent in 2004 for a tabletlike device. It may have been related to the iPhone, but to completely write off the tablet concept seems a tad suspect (of course, touch-screen technology has changed between 2004 and 2010).
In 2008, Jobs was famously not impressed with Amazon's Kindle. "It doesn't matter how good or bad the product is, the fact is that people don't read anymore," he said. "Forty percent of the people in the U.S. read one book or less last year. The whole conception is flawed at the top because people don't read any more." Yet, when he introduced the iPad back in January, he was more complimentary: "Amazon's done a great job at pioneering this functionality with their Kindle, and we're going to stand on their shoulders and go a bit further."