From the Mac news site
MacMinute: It appears as though Apple has removed all of the "Switch" commercials from its web site. When trying to view the ads, which used to be available
here, you are redirected to Apple's "Switching to Mac: Real Stories" page. In April, Apple removed the "Switch" tab graphic from the top of its web site navigation to make room for the "Music" tab, although all of the content remained at apple.com/switch. Several media outlets have recently claimed that the campaign was a failure, citing stagnant Apple market share numbers. Also, read our interview with a switcher
here.