Michael Herman posts an email from a New Orleans pathologist, received via a friend of his, via family and collegial connections, and paints a pretty real picture:

The city now has no clean water, no sewerage system, no electricity, and no real communications. Bodies are still being recovered floating in the floods. We are worried about a cholera epidemic. Even the police are without effective communications. We have a group of armed police here with us at the hotel that is admirably trying to exert some local law enforcement. This is tough because looting is now rampant. Most of it is not malicious looting. These are poor and desperate people with no housing and no medical care and no food or water trying to take care of themselves and their families. Unfortunately, the people are armed and dangerous. We hear gunshots frequently. Most of Canal street is occupied by armed looters who have a low threshold for discharging their weapons. We hear gunshots frequently. The looters are using makeshift boats made of pieces of styrofoam to access. We are still waiting for a significant national guard presence.