Today will be one second longer than a normal day, as the International Earth Rotation Service has declared the need for a leap second to keep everything in sync. This means that 2005 Dec 31 23:59:59 will be followed by 2005 Dec 23:59:60, which will in turn give way to 2006 Jan 01 00:00:00. Cool!
There’s more on this over at JWZ’s place; check it out. Also, how cool is it that there’s something called the “International Earth Rotation Service?”