According to the rocket scientists at NASA, tomorrow December 10th includes the second lunar eclipse of 2011. Meaning the Moon will look bloody and reddish-brown and generally radder than usual at some odd hour in the morning. It's also the last total lunar eclipse until 2014, which is as good a reason as any to get up at 5 a.m. to go look at a giant floating spacerock behind a shadow.
A quick look at the radar suggests there won't be a cloud in the sky, so visibility should be ideal if you're not the sort of person who gets unreasonable about light pollution. The Moon should start looking a curious shade of brownish-red around 4:45 a.m. local time, with the full eclipse phase happening around 6 a.m. There's also a slight chance that we lucky West Coasters will get to see a rare sight called a "selenelion", which is when both the sun and the eclipsed Moon can be seen in the sky at the same time.
Photographers, if you're heading out to get a shot of the red moon behind the international orange of the Golden Gate Bridge, it sounds like Fort Baker will be your best vantage point to get the angle right. Don't forget your tripod.
