Tomorrow (2/13/09) is both Friday the 13th, a scary day for those of you with paraskevidekatriaphobia, and it is also 1234567890 day.
What is 1234567890 day? At 6:31 pm EST tomorrow, the Unix time will be 1234567890. That is, exactly 1234567890 seconds will have elapsed since midnight Coordinated Universal Time (UTC), January 1, 1970, not counting leap seconds.
You can watch a countdown here.
Enjoy the day!