Total lunar eclipses happen when the earth gets between the sun and the moon. Because of the relatively low amount of particulates in the air it should look chocolate and brown.

MMmmm.... chocolate.

The eclipse starts tomorrow (thursday the 15th) at 10pm EDT and ends around 1am.

Update: Damnit. Its completely overcast. Can't see a thing..

Total Lunar Eclipse: May 15-16, 2003