Why 09/09/09 Is So Special - Yahoo! News
More about 9 than you really wanted to know.
"Not only does the date look good in marketing promotions, but it also represents the last set of repeating, single-digit dates that we'll see for almost a century (until January 1, 2101), or a millennium (mark your calendars for January 1, 3001), depending on how you want to count it." (il ne faut rien exagérer, il y aura le 10/10/2010, puis le 11/11/2011, puis le 12/12/2012 et après, oui, il faudra attendre un bon moment)