In 15 minutes or so, it will be 1:23 4/5/6. Take pictures and tag em' 123456. Lots of folks are already doing it!
Many people actually already celebrated 01:02:03 04/05/06, but I like the version without the seconds a bit better!
Best part is, we get to do this again in a month when the european version of this date comes around. Europe lists the date in a sane way, going from small unit to big unit (day-month-year). So may 4th 2006 will be their 123456.