Last week's earthquake in Japan has actually significantly altered our planet.  Japan sank two feet into the earth and the epicenter of the quake actually moved 13 feet by the time it was over!  Our days are actually 1.6 microseconds slower.  This article from yahoo expains.

Why did the quake shorten the day?  The earth's mass shifted towards the center, spurring the planet to spin a bit faster. Last year's massive 8.8 magnitude earthquake in Chile also shortened the day, but by an even smaller fraction of a second. The 2004 Sumatra quake knocked a whopping 6.8 micro-seconds off the day.

Once again, as I read this stuff, I think about the Hollywood disaster movies.  Did anybody see the movie 2012 with Jon Cusack?