People used to think it was a bad omen. It's actually just a factor of how sunlight refracts through the Earth's atmosphere to hit the moon. We only see the red coloring during a total lunar eclipse. The moon doesn't vanish, but it's only lit by the light that is bent around the Earth.
The more dust and pollution in the atmosphere, the redder the moon turns - so in some ways a blood colored moon may be a bad omen.
Totality will be visible from:
Sao Paulo, Brazil
Rio de Janeiro
Check www.timeanddate.com to find out when, exactly, it happens. It's going to be visible here from 1am until moonset. I'm tossing up whether staying up or getting up to peek is worth it.
Except maybe it's a bad omen after all - I just checked my calendar and it corresponds with...Passover.
Hrm. Conspiracy theorists should be having way more fun with this than they are.