September 9, 2009: 09-09-09.  Today is the last time a triplicate of singe digits converge for this century.

Those who market for a living see 09-09-09 as a day for making money. A new collection of Beatles songs, an animated movie about the apocalypse and a new Ipod from Apple.

Writes Heather Whipps of Live Science:

Have special plans this 09/09/09?

Everyone from brides and grooms to movie studio execs are celebrating the upcoming calendrical anomaly in their own way.

In Florida, at least one county clerk’s office is offering a one-day wedding special for $99.99. The rarity of this Sept. 9 hasn’t been lost on the creators of the iPod, who have moved their traditional Tuesday release day to Wednesday to take advantage of the special date. Focus Features is releasing their new film "9," an animated tale about the apocalypse, on the 9th.

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.

Though technically there’s nothing special about the symmetrical date, some concerned with the history and meaning of numbers ascribe powerful significance to 09/09/09.

For cultures in which the number nine is lucky, Sept. 9 is anticipated – while others might see the date as an ominous warning.

It also gives bloggers something to write about on a slow day.