Seven years ago, at the MacWorld conference in January of 2006, Steve Jobs stunned his audience by taking a few seconds at the end of the keynote to comment on the fact that Apple would be turning 30 years old on April 1 that year. It was a very rare look back from a man who prided himself on his vision going forward, who eschewed museums and awards and other such remembrances. Tim Cook yesterday noted that today is the 29th anniversary of the introduction of the Macintosh in a similarly brief way.